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Caffeine

Author: Dr. med. vet. Gisa Löwe | Last modified: 17.02.2026

Definition

Caffeine is a naturally occurring alkaloid that acts as a stimulant on the central nervous system (CNS). In dogs and cats, caffeine can cause significant signs of intoxication / poisoning even at relatively low doses. This is due to the much slower metabolism of caffeine in our pets’ bodies compared to humans. While humans can break down caffeine relatively quickly via the liver, it remains in the bloodstream much longer in dogs and cats and can therefore produce stronger and longer-lasting effects.

Caffeine acts as an antagonist at adenosine receptors, preventing the fatigue signals in the brain that are normally mediated by adenosine. In addition, it inhibits the breakdown of epinephrine, leading to a prolonged effect of this stress hormone. At higher doses, caffeine directly stimulates the respiratory center and the cardiovascular system. At toxic doses, excessive stimulation occurs, which can lead to life-threatening complications.

The most important facts at a glance

Caffeine poisoning in dogs and cats is a potentially life-threatening emergency caused by ingestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems. of caffeinated products such as coffee, tea, energy drinks, chocolate, or medications. Due to the slower metabolism of caffeine in pets compared to humans, even relatively small amounts can cause severe signs of intoxication / poisoningIntoxication / poisoning refers to poisoning caused by the intake of toxic substances. This can be caused by medications, drugs, chemicals, or other poisons and often requires medical treatment..

Clinical symptoms typically develop within 1–2 hours after ingestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems. and range from Restlessness, excitability, and tachycardiaTachycardia refers to an unusually fast heartbeat with a resting heart rate of over 100 beats per minute. It can indicate physical exertion, stress, illness, or heart problems. in mild cases to Convulsions, severe Cardiac arrhythmiaAn arrhythmia is a heart rhythm disorder in which the heart beats irregularly, either too fast (tachycardia), too slow (bradycardia), or with an irregular pattern. Arrhythmias can be harmless or a sign of serious heart problems., and multipleMultiple means manifold or repeated and is used to describe conditions or events that occur in multiple instances or at different locations. In veterinary medicine, this may indicate multiple lesions, tumors, or other pathological changes. organ failure in severe intoxication / poisoningIntoxication / poisoning refers to poisoning caused by the intake of toxic substances. This can be caused by medications, drugs, chemicals, or other poisons and often requires medical treatment.. DiagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. is based primarily on the medical historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits. and clinical presentation, supported by laboratory tests.

therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. includes decontaminationDecontamination refers to the removal of toxic substances or pathogens from a living being, object, or environment to prevent or treat poisoning or infection. measures such as inducing Vomiting and administering activated charcoalActivated charcoal is a fine-pored, highly adsorbing material commonly used in veterinary medicine to treat poisoning. It binds toxins in the gastrointestinal tract to prevent their absorption into the body., followed by symptomatic treatment of neurological and cardiovascular manifestations. With early detection and appropriate therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions., the prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. is good in most cases, although severe poisoning can be fatal despite intensive care.

Preventive measures such as safely storing caffeinated products out of pets’ reach and educating all household members about the risks are crucial to avoid caffeine poisoning.

Causes, development and progression

At low doses, caffeine primarily stimulates the brain by preventing the fatigue signals normally mediated by neurotransmitters.
Because caffeine also slows the breakdown of epinephrineEpinephrine, also known as epinephrine, is a hormone and neurotransmitter released by the body in stressful situations. It increases heart rate, blood pressure, and blood sugar levels, preparing the body for a "fight-or-flight" response., a strongly stimulating hormoneHormones are chemical messengers produced by endocrine glands and released into the bloodstream to affect specific cells or organs in the body. They regulate numerous bodily functions, including growth, metabolism, and reproduction. in the body (alarm hormoneHormones are chemical messengers produced by endocrine glands and released into the bloodstream to affect specific cells or organs in the body. They regulate numerous bodily functions, including growth, metabolism, and reproduction.), its effects last longer.
At higher doses, breathing and heart function are stimulated.
If too much caffeine is ingested, intoxication / poisoningIntoxication / poisoning refers to poisoning caused by the intake of toxic substances. This can be caused by medications, drugs, chemicals, or other poisons and often requires medical treatment. with serious consequences can occur.

The most common sources of caffeine poisoning in pets are:

Caffeinated foods and drinks are the main cause of poisoning. Particularly dangerous are:

Coffee and coffee products (especially coffee beans and espresso powder)
Energy drinks with high caffeine content
Tea and tea-containing products
Chocolate (contains caffeine in addition to theobromine)
Caffeine-containing medications and dietary supplements
Weight loss preparations
Painkillers with added caffeine
Pre-workout supplements for athletes
Caffeine-containing cosmetics and household products

Especially risky are concentrated caffeine powders or tablets intended for human consumption. Even small amounts can be fatal for pets. In a 5 kg dog, as little as 700 mg of caffeine can be toxic—this is roughly equivalent to two to three tablets containing 200 mg of caffeine each, or a cup of highly concentrated espresso.

The time of year can influence the risk of caffeine poisoning. During the Christmas season, the risk increases due to higher consumption of chocolate and coffee pastries in households. In summer, poisonings from iced coffee and cold coffee drinks increase, as they are often left within reach unattended.

Mechanism of action

Intoxication / poisoningIntoxication / poisoning refers to poisoning caused by the intake of toxic substances. This can be caused by medications, drugs, chemicals, or other poisons and often requires medical treatment. with caffeine can lead to ventricular tachycardiaTachycardia refers to an unusually fast heartbeat with a resting heart rate of over 100 beats per minute. It can indicate physical exertion, stress, illness, or heart problems., which may progress to ventricular fibrillationFibrillation is an irregular, often rapid heart rate that leads to a chaotic rhythm in the atria or ventricles of the heart. This can impair cardiac output and often requires medical treatment. without adequate cardiac output. As a result, blood pressure drops dramatically. Oxygen supply to all organs is inadequate, leading to metabolicMetabolic refers to metabolism, i.e. the entirety of chemical processes that take place in a living organism to enable life processes. Metabolic disorders can cause a variety of Diseases in Dogs and cats. acidosisAcidosis is a condition in which the pH value in the body is too acidic, either due to an increase in acid or a loss of bases. In dogs and cats, acidosis can occur due to renal failure, diabetes, or other metabolic disorders. and multipleMultiple means manifold or repeated and is used to describe conditions or events that occur in multiple instances or at different locations. In veterinary medicine, this may indicate multiple lesions, tumors, or other pathological changes. organ failure.

While caffeine is harmless to humans in moderate amounts, it can be highly toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. to dogs and cats. This is due to slow metabolism, high receptor sensitivity, and the fact that animals cannot break down even small doses as effectively as humans.

1. Chemical Classification: Methylxanthines

Caffeine belongs to the methylxanthine group, along with theobromine (the main toxinA toxin is a poison produced by living cells or organisms that can be harmful to the body upon contact or ingestion. Toxins can originate from bacteria, plants, animals, or fungi. in chocolate) and theophylline (from tea). These substances can affect multipleMultiple means manifold or repeated and is used to describe conditions or events that occur in multiple instances or at different locations. In veterinary medicine, this may indicate multiple lesions, tumors, or other pathological changes. physiological systems at the same time, especially:

Central Nervous SystemThe CNS (central nervous system) consists of the brain and spinal cord. It is responsible for processing information and controls most functions of the body and behavior.
Cardiovascular System
Musculature (smooth and striated)
GastrointestinalGastrointestinal refers to the gastrointestinal tract, a system that extends from the oral cavity to the anus and is responsible for the digestion of food and the absorption of nutrients. tract
Kidneys

2. Main Mechanisms of Action of Caffeine

A) Adenosine Receptor Antagonism

Caffeine competitively blocks adenosine receptors (especially A1 and A2A) in the brain.
Under physiological conditions, adenosine has calming, sleep-inducing, and vasodilating effects.
This blockade increases neuronal activity, leading to Restlessness, hyperactivityHyperactivity refers to an excessively high level of activity that goes beyond normal behavior. In dogs and cats, hyperactivity can be caused by behavioral problems, neurological disorders, or reactions to medications or toxins., a tendency to seizures, and insomnia.

B) Phosphodiesterase Inhibition

Caffeine inhibits the phosphodiesterase that breaks down cyclicCyclic refers to events or processes that recur at regular intervals. In veterinary medicine, this can refer to the regular reproductive cycles in female dogs and cats, or to cyclic disease courses. adenosine monophosphate (cAMP).
This leads to an increase in cAMP in cells, promoting, for example, heart rate, bronchodilation, lipolysisLipolysis is the process of fat breakdown in the body, where triglycerides are broken down into glycerol and free fatty acids. This process provides energy for the body., and smooth muscle relaxation.
The result is hyperstimulation of the circulatory system and metabolism.

c) Calcium release from intracellular stores

Caffeine increases the release of calciumCalcium is a mineral that is essential for building and maintaining strong bones and teeth. It also plays a role in blood coagulation, nerve transmission, and muscle contraction. from the sarcoplasmic reticulum.
This increases the contractile force of the heart and skeletal muscles, but can also lead to muscle tremors, fasciculations, or Seizures.

3. Systemic Effects in Dogs and Cats

Organ System	Effect of Caffeine
central nervous systemThe CNS (central nervous system) consists of the brain and spinal cord. It is responsible for processing information and controls most functions of the body and behavior. (CNSCNS stands for the central nervous system, which consists of the brain and the spinal cord. It is responsible for processing information and controls many functions of the body.)	AgitationAgitation refers to a state of increased Restlessness or nervous activity that can be caused in dogs and cats by pain, fear, neurological disorders, or other medical problems., Restlessness, tremors, hyperreflexia, Seizures, possibly comaA coma is a deep state of unconsciousness where an individual cannot be awakened and does not respond to stimuli. In dogs and cats, it can be caused by severe illnesses, poisoning, or neurological problems.
Cardiovascular system	tachycardiaTachycardia refers to an unusually fast heartbeat with a resting heart rate of over 100 beats per minute. It can indicate physical exertion, stress, illness, or heart problems., arrhythmias, hypertensionHypertension, or high blood pressure, is a condition in which the blood pressure in the arteries is consistently elevated. In dogs and cats, this can lead to damage to organs such as the heart, kidneys, and eyes, and requires medical treatment., increased blood pressure, Cardiac arrhythmiaAn arrhythmia is a heart rhythm disorder in which the heart beats irregularly, either too fast (tachycardia), too slow (bradycardia), or with an irregular pattern. Arrhythmias can be harmless or a sign of serious heart problems.
GastrointestinalGastrointestinal refers to the gastrointestinal tract, a system that extends from the oral cavity to the anus and is responsible for the digestion of food and the absorption of nutrients. tract	Nausea, Vomiting, DiarrheaDiarrhea refers to the condition of frequent, watery bowel movements, which can be a sign of infections, digestive disorders, or other health problems., AbdominalThe term "abdominal" refers to anything that concerns the belly or the abdomen. It is an adjectival expression used to describe the location, symptoms, or conditions that occur in the abdominal area. pain
Muscles	tremors, Muscle twitching, Stiffness, possibly hyperthermiaHyperthermia refers to an elevated body temperature beyond the normal range. In dogs and cats, this can be caused by overheating, Fever, or certain diseases, and often requires urgent medical attention. due to muscle activity
Kidneys and urinary tract	polyuriaPolyuria refers to a significantly increased urine output. It can be a symptom of various diseases, including diabetes mellitus, kidney disease, and hormonal disorders. due to increased diuresisDiuresis is the increase in urine excretion by the kidneys. It is a natural process for removing excess water and waste products from the body. (caffeine-induced vasodilation in the kidney)

4. Species-Specific Characteristics

Dog:

Dogs are very sensitive to caffeine because they metabolize it slowly through the liver.
ToxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. dose: from approx. 20 mg/kg, severe symptoms from >100 mg/kg, lethal dose from >140–150 mg/kg.
Particularly dangerous: ingestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems. of coffee pods, capsules, energy drinks, diet pills, or powdered preparations.

Cat:

Cats are also sensitive but less frequently show signs of poisoning, as their feeding behavior means they are less likely to voluntarily ingest caffeine-containing substances.
The toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity. threshold is similar to that in dogs, and symptoms can occur even with small amounts (e.g., 1–2 coffee beans).

5. Toxicokinetics

absorptionAbsorption refers to the uptake of substances by living cells or tissues. In the context of veterinary medicine, it often refers to the absorption of nutrients, drugs, or toxins from the digestive tract into the bloodstream.: Rapid after oralOral means "through the mouth" and refers to the intake of food, medication, or other substances through the mouth. In veterinary medicine, many treatments are administered orally. intake (peak plasmaPlasma is the liquid part of blood in which blood cells are suspended. It contains water, salts, proteins, and other substances and serves as a transport medium for nutrients, hormones, and waste products. levels after 30–60 minutes)
Metabolism: Via the liver (Cytochrome P450 system), slower in dogs and cats than in humans
eliminationElimination refers to the process by which waste products and toxins are removed from the body. This includes excretion via the kidneys (urine), intestines (stool), lungs (breath), and skin.: Via urine (partly unchanged)
Half-life: Dog approx. 4–6 hours (but significantly longer at high doses due to saturation of liver enzymesEnzymes are biological catalysts that accelerate specific chemical reactions in the body without being consumed. They play a crucial role in virtually all physiological processes.)

6. Summary of the toxic effects

Level of Action	Mechanism	Consequences
CNSCNS stands for the central nervous system, which consists of the brain and the spinal cord. It is responsible for processing information and controls many functions of the body. (central nervous systemThe CNS (central nervous system) consists of the brain and spinal cord. It is responsible for processing information and controls most functions of the body and behavior.)	Adenosine receptor blockade → neuronal overstimulation	Restlessness, Seizures, anxiety, tremors, Convulsions
Cardiovascular	Increased cAMP + Ca²⁺ mobilization → increased excitability	tachycardiaTachycardia refers to an unusually fast heartbeat with a resting heart rate of over 100 beats per minute. It can indicate physical exertion, stress, illness, or heart problems., arrhythmias, hypertensionHypertension, or high blood pressure, is a condition in which the blood pressure in the arteries is consistently elevated. In dogs and cats, this can lead to damage to organs such as the heart, kidneys, and eyes, and requires medical treatment.
Muscles	CalciumCalcium is a mineral that is essential for building and maintaining strong bones and teeth. It also plays a role in blood coagulation, nerve transmission, and muscle contraction. release → increased contraction	muscle tremors, fasciculations, hyperthermiaHyperthermia refers to an elevated body temperature beyond the normal range. In dogs and cats, this can be caused by overheating, Fever, or certain diseases, and often requires urgent medical attention.
GastrointestinalGastrointestinal refers to the gastrointestinal tract, a system that extends from the oral cavity to the anus and is responsible for the digestion of food and the absorption of nutrients. tract	Irritation due to direct effects and centrally mediated nausea	Vomiting, diarrheaDiarrhea refers to the condition of frequent, watery bowel movements, which can be a sign of infections, digestive disorders, or other health problems., AbdominalThe term "abdominal" refers to anything that concerns the belly or the abdomen. It is an adjectival expression used to describe the location, symptoms, or conditions that occur in the abdominal area. pain
Kidney and bladder	Increased diuresisDiuresis is the increase in urine excretion by the kidneys. It is a natural process for removing excess water and waste products from the body. due to cAMP effects	polyuriaPolyuria refers to a significantly increased urine output. It can be a symptom of various diseases, including diabetes mellitus, kidney disease, and hormonal disorders., increased thirst

Conclusion

Caffeine is a highly potent neurotoxin for dogs and cats. It acts through adenosine receptor blockade, phosphodiesterase inhibition, and intracellular calciumCalcium is a mineral that is essential for building and maintaining strong bones and teeth. It also plays a role in blood coagulation, nerve transmission, and muscle contraction. release, leading to multisystem overstimulation. Especially dangerous are coffee grounds, energy drinks, diet supplements, or caffeine tablets, which can be toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. even in small amounts. Due to slow breakdown and high sensitivity, caffeine poisoning is considered a veterinary emergency requiring immediate veterinary care.

Symptoms of intoxication

Restlessness
increased excitability
Increased urination
muscle cramps
Increased heart rate (tachycardiaTachycardia refers to an unusually fast heartbeat with a resting heart rate of over 100 beats per minute. It can indicate physical exertion, stress, illness, or heart problems.)

As intoxication / poisoningIntoxication / poisoning refers to poisoning caused by the intake of toxic substances. This can be caused by medications, drugs, chemicals, or other poisons and often requires medical treatment. progresses, it can lead to

Tremor
seizures
Cardiac Arrhythmias

In dogs, 140 mg of caffeine/kg body weight can be toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes..
In cats, this value is between 80 and 150 mg/kg body weight.
Table 1 lists the threshold values for various caffeinated medications or foods at which dogs show signs of poisoning.
Table 2 contains the corresponding information for cats.
Caffeine-containing tablets in particular can be dangerous for small dogs and cats.

Supplements

Clinical signs of caffeine poisoning usually develop within 1–2 hours after ingestion and can vary in severity depending on the amount consumed. The symptoms reflect the stimulating effect on the central nervous systemThe CNS (central nervous system) consists of the brain and spinal cord. It is responsible for processing information and controls most functions of the body and behavior. (CNSCNS stands for the central nervous system, which consists of the brain and the spinal cord. It is responsible for processing information and controls many functions of the body.) and the cardiovascular system.

In mild to moderate poisonings, affected animals initially show:

Restlessness and Nervousness
Increased excitability and hyperactivityHyperactivity refers to an excessively high level of activity that goes beyond normal behavior. In dogs and cats, hyperactivity can be caused by behavioral problems, neurological disorders, or reactions to medications or toxins.
Increased urination (polyuriaPolyuria refers to a significantly increased urine output. It can be a symptom of various diseases, including diabetes mellitus, kidney disease, and hormonal disorders.)
Increased heart rate (tachycardiaTachycardia refers to an unusually fast heartbeat with a resting heart rate of over 100 beats per minute. It can indicate physical exertion, stress, illness, or heart problems.)
Panting and rapid breathing
Vomiting and diarrheaDiarrhea refers to the condition of frequent, watery bowel movements, which can be a sign of infections, digestive disorders, or other health problems.
Elevated body temperature

Muscle Tremors (Tremor)
Stiff limbs
Ataxia (Coordination disorders)
Convulsions
Cardiac arrhythmiaAn arrhythmia is a heart rhythm disorder in which the heart beats irregularly, either too fast (tachycardia), too slow (bradycardia), or with an irregular pattern. Arrhythmias can be harmless or a sign of serious heart problems. (arrhythmias)
HypertensionHypertension, or high blood pressure, is a condition in which the blood pressure in the arteries is consistently elevated. In dogs and cats, this can lead to damage to organs such as the heart, kidneys, and eyes, and requires medical treatment., followed by hypotension
CyanosisCyanosis refers to a bluish discoloration of the skin and mucous membranes, caused by an inadequate oxygen supply to the blood. It can be a sign of heart, lung, or blood diseases. (bluish discoloration of the mucous membranes)
ComaA coma is a deep state of unconsciousness where an individual cannot be awakened and does not respond to stimuli. In dogs and cats, it can be caused by severe illnesses, poisoning, or neurological problems.

In particularly severe cases, multipleMultiple means manifold or repeated and is used to describe conditions or events that occur in multiple instances or at different locations. In veterinary medicine, this may indicate multiple lesions, tumors, or other pathological changes. organ failure can occur, characterized by metabolicMetabolic refers to metabolism, i.e. the entirety of chemical processes that take place in a living organism to enable life processes. Metabolic disorders can cause a variety of Diseases in Dogs and cats. acidosisAcidosis is a condition in which the pH value in the body is too acidic, either due to an increase in acid or a loss of bases. In dogs and cats, acidosis can occur due to renal failure, diabetes, or other metabolic disorders. and inadequate oxygen supply to the organs. Without rapid veterinary intervention, severe caffeine poisoning can lead to Death within a few hours.

Cats show similar symptoms to dogs but are often more sensitive to caffeine and can develop severe symptoms at lower doses.

Diagnosis

The diagnosis of caffeine poisoning is based primarily on the medical historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits. and the clinical presentation. Because caffeine poisoning can quickly become life-threatening, rapid diagnosis is crucial for treatment success.

The most important diagnostic factor is the owner’s report. Information about possible ingestion of caffeinated substances, the estimated amount, and the time of ingestion is crucial for diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. and therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. planning. Veterinarians should specifically ask about coffee, energy drinks, chocolate, tea, or caffeinated medications in the household.

The clinical examination includes:

General examination with a special focus on vital parameters
Cardiovascular examination (heart rate, heart rhythm, pulse quality)
Neurological examination to assess the level of AgitationAgitation refers to a state of increased Restlessness or nervous activity that can be caused in dogs and cats by pain, fear, neurological disorders, or other medical problems.
Measurement of body temperature

Laboratory diagnostics can support the clinical diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients.:

Complete blood count and serumSerum is the liquid part of the blood that remains after coagulation. It does not contain blood cells or coagulation factors, but many other proteins, antibody and electrolytes. Serum is used in diagnostics for a variety of blood tests. chemistry to assess organ function
Electrolyte testing to detect imbalances
Blood gas analysis to assess possible metabolicMetabolic refers to metabolism, i.e. the entirety of chemical processes that take place in a living organism to enable life processes. Metabolic disorders can cause a variety of Diseases in Dogs and cats. acidosisAcidosis is a condition in which the pH value in the body is too acidic, either due to an increase in acid or a loss of bases. In dogs and cats, acidosis can occur due to renal failure, diabetes, or other metabolic disorders.
ECG to detect and monitor Cardiac arrhythmiaAn arrhythmia is a heart rhythm disorder in which the heart beats irregularly, either too fast (tachycardia), too slow (bradycardia), or with an irregular pattern. Arrhythmias can be harmless or a sign of serious heart problems.

In specialized laboratories, caffeine can be detected in blood or urine, but this is usually not available in a timely manner for acuteAcute refers to a condition that occurs suddenly and is usually of short duration. In a medical context, it describes symptoms or illnesses that can quickly become serious and require immediate attention. therapy and is therefore of secondary importance.

In terms of differential diagnosisDifferential diagnosis is the process of weighing two or more conditions that cause similar symptoms to determine the specific cause of a patient's symptoms., other intoxication / poisoningIntoxication / poisoning refers to poisoning caused by the intake of toxic substances. This can be caused by medications, drugs, chemicals, or other poisons and often requires medical treatment. with a similar symptom profile must be considered, especially:

Theobromine poisoning (often simultaneously with caffeine in chocolate poisoning)
Amphetamine poisoning
Poisoning with other stimulants
Hyperthyroidism

Epilepsy or other neurological diseases in cases of isolated Convulsions

Therapeutic principles

There is no antidote.
decontaminationDecontamination refers to the removal of toxic substances or pathogens from a living being, object, or environment to prevent or treat poisoning or infection. is carried out by inducing Vomiting or performing gastric lavageLavage is a rinsing procedure that uses a liquid to clean a body cavity, organ, or wound. In veterinary medicine, lavage can be used, for example, for gastric lavage or to clean an infected wound., as well as administering activated charcoalActivated charcoal is a fine-pored, highly adsorbing material commonly used in veterinary medicine to treat poisoning. It binds toxins in the gastrointestinal tract to prevent their absorption into the body. at 4-hour intervals.
therapy is primarily symptomatic.
Seizures can be counteracted with appropriate sedativesSedatives are medications used to reduce Nervousness, anxiety, or Agitation and to achieve a calming effect. They are used in dogs and cats for various medical procedures or to calm them in stressful situations..
In cases of pronounced arrhythmias, repeated administration of lidocaine is necessary.
In very severe intoxication / poisoningIntoxication / poisoning refers to poisoning caused by the intake of toxic substances. This can be caused by medications, drugs, chemicals, or other poisons and often requires medical treatment., lidocaine should be given as a continuous infusion after an initialInitial means beginning or at the start. In medicine, it can refer to the first symptoms of a disease or the first phase of a treatment process. bolus dose until a stable heart rhythm can be consistently confirmed on an ECG.
In cases with severe impairment of heart function, life-threatening metabolicMetabolic refers to metabolism, i.e. the entirety of chemical processes that take place in a living organism to enable life processes. Metabolic disorders can cause a variety of Diseases in Dogs and cats. acidosisAcidosis is a condition in which the pH value in the body is too acidic, either due to an increase in acid or a loss of bases. In dogs and cats, acidosis can occur due to renal failure, diabetes, or other metabolic disorders. can occur and must be treated as an emergency.
With progressiveProgressive describes a condition or disease that worsens over time. This term is often used to characterize the course of an illness that causes increasingly severe symptoms or damage. heart failure due to severe rhythm disturbances, all vital functionsVital functions are essential bodily functions necessary to sustain life. These include breathing, heart rate, blood pressure, body temperature, and level of consciousness. are impaired and require complex intensive care.

Supplements

Treatment of caffeine poisoning is symptomatic because no specific antidoteAn antidote is a substance used to neutralize or reverse the harmful effects of poisoning or a drug overdose. Antidotes can be specific to certain poisons or have more general detoxifying effects. exists. Therapeutic measures depend on the severity of the intoxication / poisoningIntoxication / poisoning refers to poisoning caused by the intake of toxic substances. This can be caused by medications, drugs, chemicals, or other poisons and often requires medical treatment. and the time since ingestion.

If ingestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems. was recent (within 1–2 hours), decontaminationDecontamination refers to the removal of toxic substances or pathogens from a living being, object, or environment to prevent or treat poisoning or infection. is the priority:

Inducing Vomiting by administering apomorphine in dogs or xylazine in cats, provided the animal is conscious and not showing Convulsions
Gastric lavageLavage is a rinsing procedure that uses a liquid to clean a body cavity, organ, or wound. In veterinary medicine, lavage can be used, for example, for gastric lavage or to clean an infected wound. under general anesthesia if large amounts were ingested or if Vomiting is contraindicated
Administration of activated charcoalActivated charcoal is a fine-pored, highly adsorbing material commonly used in veterinary medicine to treat poisoning. It binds toxins in the gastrointestinal tract to prevent their absorption into the body. (initialInitial means beginning or at the start. In medicine, it can refer to the first symptoms of a disease or the first phase of a treatment process. 1–4 g/kg body weight) to bind caffeine in the gastrointestinalGastrointestinal refers to the gastrointestinal tract, a system that extends from the oral cavity to the anus and is responsible for the digestion of food and the absorption of nutrients. tract
Repeated administration of activated charcoalActivated charcoal is a fine-pored, highly adsorbing material commonly used in veterinary medicine to treat poisoning. It binds toxins in the gastrointestinal tract to prevent their absorption into the body. every 4–6 hours, as caffeine undergoes enterohepatic circulation

Symptomatic therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. includes:

Intravenous fluid therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. to promote renal excretion and stabilize circulation
Control of Convulsions with diazepam (0.5–2 mg/kg IV) or phenobarbital for refractory seizures
Treatment of Cardiac arrhythmiaAn arrhythmia is a heart rhythm disorder in which the heart beats irregularly, either too fast (tachycardia), too slow (bradycardia), or with an irregular pattern. Arrhythmias can be harmless or a sign of serious heart problems. with lidocaine (2 mg/kg as a bolus, followed by 40 to 80 µg/kg/min as a continuous infusion) for ventricular arrhythmias
Beta-blockers such as propranolol for tachycardiaTachycardia refers to an unusually fast heartbeat with a resting heart rate of over 100 beats per minute. It can indicate physical exertion, stress, illness, or heart problems., but with caution and under continuous monitoring
Control of hyperthermiaHyperthermia refers to an elevated body temperature beyond the normal range. In dogs and cats, this can be caused by overheating, Fever, or certain diseases, and often requires urgent medical attention. through external cooling
In metabolicMetabolic refers to metabolism, i.e. the entirety of chemical processes that take place in a living organism to enable life processes. Metabolic disorders can cause a variety of Diseases in Dogs and cats. acidosisAcidosis is a condition in which the pH value in the body is too acidic, either due to an increase in acid or a loss of bases. In dogs and cats, acidosis can occur due to renal failure, diabetes, or other metabolic disorders., administration of sodiumSodium is a vital electrolyte that plays a key role in regulating water balance, blood pressure, and nerve and muscle activity. Unbalanced sodium levels can lead to various health problems in dogs and cats. bicarbonate may be necessary

In severe cases, intensive care monitoring with continuous ECG monitoring, regular blood pressure measurement, and monitoring of blood gas values is essential. With progressiveProgressive describes a condition or disease that worsens over time. This term is often used to characterize the course of an illness that causes increasingly severe symptoms or damage. heart failure due to severe rhythm disturbances, complex cardiopulmonary support may be required.

Prognosis & follow-up care

Because severe intoxication / poisoningIntoxication / poisoning refers to poisoning caused by the intake of toxic substances. This can be caused by medications, drugs, chemicals, or other poisons and often requires medical treatment. is rare and generally only expected after ingestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems. of pure caffeine in powder or tablet form, the prognosis is generally very good.

The prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. for caffeine poisoning depends largely on the amount ingested, the time elapsed before treatment, and the animal’s individual health status. With early detection and appropriate therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions., the prognosis is good to very good in most cases.

Animals treated within the first 24 hours after ingestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems. that do not develop serious complications such as persistentPersistent means lasting or continuing for an extended period. In veterinary medicine, it can refer to chronic diseases or symptoms that do not subside. Convulsions or life-threatening Cardiac arrhythmiaAn arrhythmia is a heart rhythm disorder in which the heart beats irregularly, either too fast (tachycardia), too slow (bradycardia), or with an irregular pattern. Arrhythmias can be harmless or a sign of serious heart problems. have a survival rate of over 90%. Recovery time is usually 24–48 hours, as the half-life of caffeine in dogs and cats is significantly longer than in humans.

Factors that can negatively affect the prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop.:

IngestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems. of very high doses (>150 mg/kg in dogs, >100 mg/kg in cats)
Pre-existing heart or liver diseases
Delayed veterinary treatment
Development of status epilepticus or malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats. Cardiac arrhythmiaAn arrhythmia is a heart rhythm disorder in which the heart beats irregularly, either too fast (tachycardia), too slow (bradycardia), or with an irregular pattern. Arrhythmias can be harmless or a sign of serious heart problems.
Very young or very old animals

Aftercare following caffeine poisoning includes:

Follow-up examinations to monitor heart function, especially in animals that have developed severe arrhythmias
Monitoring kidney function, as forced diuresisDiuresis is the increase in urine excretion by the kidneys. It is a natural process for removing excess water and waste products from the body. and possible circulatory instability can lead to kidney damage
A gentle diet for 24–48 hours, especially in animals with gastrointestinalGastrointestinal refers to the gastrointestinal tract, a system that extends from the oral cavity to the anus and is responsible for the digestion of food and the absorption of nutrients. symptoms
Rest and stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. reduction during the recovery phase

Long-term effects are rare in surviving animals, but may occur as subtle neurological deficits or cardiac changes, especially if prolonged hypoxiaHypoxia refers to a condition in which the body or a part of the body is not supplied with enough oxygen. This can lead to various symptoms, including shortness of breath, confusion, and in severe cases, organ failure. occurred during the acuteAcute refers to a condition that occurs suddenly and is usually of short duration. In a medical context, it describes symptoms or illnesses that can quickly become serious and require immediate attention. phase.

Research outlook

Current research in caffeine poisoning in small animals focuses on several promising areas that could improve management and treatment outcomes.

Recent studies are investigating more specific antagonists for adenosine receptors that could potentially be used as an antidoteAn antidote is a substance used to neutralize or reverse the harmful effects of poisoning or a drug overdose. Antidotes can be specific to certain poisons or have more general detoxifying effects. in caffeine poisoning. These substances could competitively inhibit caffeine binding to its target receptors and thus reduce the stimulating effects. InitialInitial means beginning or at the start. In medicine, it can refer to the first symptoms of a disease or the first phase of a treatment process. preclinical studies show promising results, but clinical trials in dogs and cats are still pending.

Another research focus is on improved decontaminationDecontamination refers to the removal of toxic substances or pathogens from a living being, object, or environment to prevent or treat poisoning or infection. procedures. New formulations of activated charcoalActivated charcoal is a fine-pored, highly adsorbing material commonly used in veterinary medicine to treat poisoning. It binds toxins in the gastrointestinal tract to prevent their absorption into the body. with increased binding capacity for methylxanthines such as caffeine and theobromine are being developed and could improve the effectiveness of gastrointestinalGastrointestinal refers to the gastrointestinal tract, a system that extends from the oral cavity to the anus and is responsible for the digestion of food and the absorption of nutrients. decontaminationDecontamination refers to the removal of toxic substances or pathogens from a living being, object, or environment to prevent or treat poisoning or infection..

In intensive care medicine, advanced hemodialysis and hemoperfusion procedures are being evaluated, which could potentially speed up the eliminationElimination refers to the process by which waste products and toxins are removed from the body. This includes excretion via the kidneys (urine), intestines (stool), lungs (breath), and skin. of caffeine from the bloodstream. These methods could be particularly important in severe poisoning or in patients with impaired kidney or liver function.

In addition, current studies are looking at identifying genetic factors that influence individual sensitivity to caffeine. Similar to humans, there are indications that certain dog and cat breeds may respond differently to caffeine due to genetic variations in the cytochrome P450 system.

The development of faster and more cost-effective diagnostic tests to detect caffeine in blood or urine could make diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. easier in the future and enable more targeted therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions..

Frequently asked questions (FAQs)

How much caffeine is dangerous for my dog or cat?

In dogs, as little as 140 mg of caffeine per kg body weight can be toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes.; in cats, this value is between 80 and 150 mg/kg. For a 5 kg dog, this means that as little as 700 mg of caffeine—about 2–3 caffeine tablets or a cup of highly concentrated espresso—can be dangerous.

Which caffeine-containing products are particularly dangerous for my pets?

Especially risky are concentrated caffeine products such as caffeine tablets, energy drinks, coffee beans, and espresso powder. Chocolate, especially dark chocolate, is also a risk because it contains caffeine in addition to theobromine.

How quickly do symptoms of caffeine poisoning appear?

The first signs of caffeine poisoning usually appear within 1–2 hours after ingestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems.. With larger amounts, symptoms may appear sooner. The effects can last up to 12 hours because dogs and cats break down caffeine more slowly than humans.

What should I do if my pet has ingested caffeine-containing products?

Contact your veterinarian or a veterinary emergency clinic immediately. Do not try to induce Vomiting yourself, as this can be dangerous if symptoms are already present. Write down which product was ingested, how much, and when it happened.

How is caffeine poisoning treated by the veterinarian?

Treatment typically includes inducing Vomiting (if ingestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems. was recent), administering activated charcoalActivated charcoal is a fine-pored, highly adsorbing material commonly used in veterinary medicine to treat poisoning. It binds toxins in the gastrointestinal tract to prevent their absorption into the body., fluid therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions., and symptomatic treatment of Convulsions and Cardiac arrhythmiaAn arrhythmia is a heart rhythm disorder in which the heart beats irregularly, either too fast (tachycardia), too slow (bradycardia), or with an irregular pattern. Arrhythmias can be harmless or a sign of serious heart problems.. In severe cases, intensive care monitoring may be necessary.

Can my pet survive caffeine poisoning?

With early veterinary treatment, the prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. is good in most cases. The chance of survival depends on the amount ingested, the time to treatment, and the animal’s individual health status.

Are there specific risk factors that can worsen caffeine poisoning?

Young and old animals, as well as animals with pre-existing heart, liver, or kidney disease, are particularly at risk. Certain breeds may be more sensitive to caffeine due to genetic variations.

How can I prevent caffeine poisoning in my pets?

Store all caffeinated products securely out of your pets’ reach. Dispose of coffee leftovers, tea bags, and chocolate wrappers in sealed containers. Inform guests and family members about the dangers of caffeinated products for pets.

Can pets develop a tolerance to caffeine?

No, dogs and cats do not develop tolerance to caffeine. Even small, regular doses can lead to chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. health problems and should be avoided.

Are there long-term consequences after recovering from caffeine poisoning?

With full recovery, long-term effects are rare. In severe cases, however, subtle neurological deficits or cardiac changes may remain, especially if prolonged hypoxiaHypoxia refers to a condition in which the body or a part of the body is not supplied with enough oxygen. This can lead to various symptoms, including shortness of breath, confusion, and in severe cases, organ failure. occurred during the acuteAcute refers to a condition that occurs suddenly and is usually of short duration. In a medical context, it describes symptoms or illnesses that can quickly become serious and require immediate attention. phase.

Literature

https://vetmeds.org/pet-poison-control-list/caffeine/
Cortinovis C, Caloni F. Household food items toxic to dogs and cats. Frontiers in Veterinary Science. 2016; 3:26. DOI: 10.3389/fvets.2016.00026.
Tiwari RM, Sinha M, Prasad PK. Toxicological effects of caffeine on companion animals: A review. Journal of Veterinary Pharmacology and Therapeutics. 2021; 44(1):5-15. DOI: 10.1111/jvp.12894.
Peterson ME, Talcott PA. Small Animal Toxicology. 4th ed. St. Louis: Elsevier; 2022. p. 345-359.
Gwaltney-Brant SM. Chocolate, caffeine, and other methylxanthines. In: Gupta RC, editor. Veterinary Toxicology: Basic and Clinical Principles. 3rd ed. London: Academic Press; 2018. p. 477-486.
Hovda LR, Brutlag AG, Poppenga RH, Peterson KL. Blackwell’s Five-Minute Veterinary Consult Clinical Companion: Small Animal Toxicology. 2nd ed. Chichester: Wiley-Blackwell; 2016. p. 188-194.
Löwe G, Löwe O. Poisonings in Dogs and Cats – A Veterinary Guide. 2nd Edition. Kreuztal: Kynos-Verlag. 2021; 208 p.