Yew (Taxus Baccata)
The yew (Taxus baccata) is a common ornamental plant in gardens and cemeteries—but what many pet owners don’t know is that yew is extremely toxic to dogs and cats. Even the smallest amounts of needles or seeds can cause life-threatening symptoms in pets. In this article, you’ll learn everything important about yew poisoning in dogs and cats—from the causes and mechanism of action to emergency therapy and prognosis. We explain how to recognize poisoning, what measures to take, and why it makes sense to avoid keeping this dangerous plant in a household with pets.
The most important facts at a glance
The yew (Taxus baccata) is life-threatening for pets—even in the smallest amounts. Dogs in particular ingest parts of it while walking or playing. The resulting heart problems are 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. and often fatal. PreventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring., education, and immediate veterinary measures can save lives.
Causes, development and progression
Typical causes of yew poisoning in pets:
- 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 fallen needles during walks
- Eating branches or fruits in the garden
- Access to yew trimmings or Advent decorations
- Play behavior in young dogs with plant parts
- Poisoning from licked hands, clothing, or food bowls with yew residues
The red berry (aril) is not poisonous, but the seed kernel inside is 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.!
The heart, the entire nervous system, muscles, and the mucous membrane of 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 are particularly affected.
Mechanism of action
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. 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 yew components, 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. begins as early as through the gastric mucosa. Within 30 minutes to 1 hour 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., the first general symptoms may appear, mainly affecting 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.
After that, the cardiotoxicCardiotoxic describes substances or influences that are harmful to the heart. Cardiotoxic effects can impair heart function and lead to various heart problems. effects become apparent: initially a markedly increased heart rate, followed by a clearly reduced heart rate due to increasingly impaired cardiac conduction and reduced myocardial (heart muscle) contractility.
In humans, the lethal dose 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. 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. is 0.6–1.3 g of yew needles per kg of body weight. Assuming that 1 g of yew needles contains 5 mg of taxine, this corresponds to 3.0–6.5 mg of taxine per kg of body weight.
The minimum LD50 (lethal dose 50)LD50 (lethal dose 50) is a measure of a substance's toxicity and refers to the dose at which 50% of the exposed population (typically test animals) die. In veterinary medicine, the LD50 (lethal dose 50) is used to assess the potential hazard of toxins or drugs to dogs and cats. in dogs is 2.3 needles/kg body weight.
Taxine can be detected in blood, urine, and tissue samples.
Supplement
The dangerous active ingredients are Taxine A and Taxine B. These substances block in the body cells:
- 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. and 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. channels in heart muscle cells
- Signal transmission in the nervous system
Consequences of yew poisoning:
- Massive slowing of the heart rate (bradycardiaBradycardia refers to a slower than normal heart rate, typically below 60 beats per minute in adults. It can occur in healthy individuals, especially athletes, but can also be an indication of heart disease.)
- 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., AV block, cardiac arrest
- Central symptoms such as muscle tremors, unconsciousness, respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. arrest
The tricky part: the first signs often appear only 30 minutes to 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.. Death can occur within a few hours—without warning.
Symptoms of intoxication
Initially, non-specific general symptoms are to be expected.
- Vomiting
- DiarrheaDiarrhea refers to the condition of frequent, watery bowel movements, which can be a sign of infections, digestive disorders, or other health problems., sometimes bloody
- Bauchschmerzen
- Muscle weakness
- Seizures
- Drop in body temperature
The typical cardiotoxicCardiotoxic describes substances or influences that are harmful to the heart. Cardiotoxic effects can impair heart function and lead to various heart problems. effects on cardiac conduction (atrioventricular block patterns) and the decrease in heart muscle contractility follow.
- 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. (increased heart rate), initially
- BradycardiaBradycardia refers to a slower than normal heart rate, typically below 60 beats per minute in adults. It can occur in healthy individuals, especially athletes, but can also be an indication of heart disease. (decreased heart rate)
- Hypotension (drop in blood pressure)
- 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.
Effects on the nervous system are shown by
- Mydriasis
- Nervousness
- Dizziness
- Balance disorders
- Dizziness
In the final stage, dominant are
- Shortness of breath
- Muscle tremor
- LateralLateral refers to the side of the body or a body part, as opposed to medial, which describes a position closer to the midline of the body. In veterinary medicine, it is used to describe the location of structures or injuries. recumbency
- Seizures
- 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..
Death occurs as a result of cardiac arrest or respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system..
The course of taxine intoxication can be peracutePeracute describes a very sudden and extremely severe course of a disease. Peracute diseases can lead to serious health problems or Death within hours to a few days. (rapid).
Diagnosis
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 on:
- Anamnesis: Stay in a garden, park, or cemetery with yew trees
- Symptoms: Typical cardiac arrhythmias, neurological deficits
- Examination: ECG shows bradycardiaBradycardia refers to a slower than normal heart rate, typically below 60 beats per minute in adults. It can occur in healthy individuals, especially athletes, but can also be an indication of heart disease., arrhythmias, AV block
- Laboratory: IndicationIndication refers to a valid reason or rationale for using a specific treatment, medication, or medical procedure. It is based on the diagnosis and the patient's clinical condition. of 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., increased lactate
- Stomach contents/feces: Microscopically recognizable plant residues
- Special toxicological diagnostics: Detection of taxines in the laboratory
Therapeutic principles
There is no antidote.
In human medicine, sheep-derived digitalis antitoxin is used for severe digitalis glycoside intoxications. The product is imported from the USA only for special cases in human medicine. It is not available for animals.
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 still useful even several 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., as yew needles remain 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 for a very long time.
Inducing Vomiting, 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., 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. are indicated. 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. should be given repeatedly at 4-hour intervals.
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. is symptomatic.
Monitoring and optimizing 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 necessary.
Measures are based on an individual risk assessment.
The main focus of therapeutic measures is controlling and counteracting the cardiotoxicCardiotoxic describes substances or influences that are harmful to the heart. Cardiotoxic effects can impair heart function and lead to various heart problems. effects of taxine.
ECG monitoring is strongly recommended. The more severe the ECG changes (AV block), the higher the mortalityMortality is the death rate within a population over a specific period. It is often used to assess the severity of diseases or the effectiveness of health measures. rate.
Second, monitoring water, electrolyte, and acid–base balance is important.
In addition to arrhythmias, ECG changes often indicate disturbances in electrolyte balanceThe electrolyte balance refers to the balance of electrolytes in the body, which is essential for many physiological processes. Disturbances in the electrolyte balance can lead to serious health problems. (hyperkalemiaHyperkalemia refers to a potassium level in the blood that is too high. Potassium is essential for normal cell function, but an excess can lead to cardiac arrhythmia and other health problems.).
Supplement
Since there is no 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. for taxines, every minute counts. 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. is symptomatic:
Immediate Measures:
- Inducing vomiting (only in stable animals and <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.)
- 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. in 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. doses
- 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 sedationSedation refers to the state of calming or suppressing the central nervous system with medication, which reduces anxiety and irritability and sometimes induces a light sleep. (in case of high 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. intake)
Intensive Care Therapy:
- Atropine for bradycardiaBradycardia refers to a slower than normal heart rate, typically below 60 beats per minute in adults. It can occur in healthy individuals, especially athletes, but can also be an indication of heart disease.
- Antiarrhythmics (e.g., lidocaine) for ventricular extrasystoles
- 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., oxygen administration
- Continuous ECG, electrolyte monitoring
Attention:
Some animals die suddenly, even with 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.. This makes early treatment by a veterinary hospital or specialized practice all the more important.
The current potassiumPotassium is an essential mineral and electrolyte that is important for the function of nerves and muscles, including the heart muscle. Potassium also helps regulate fluid balance and blood pressure. concentration in the blood is also directly related to the mortalityMortality is the death rate within a population over a specific period. It is often used to assess the severity of diseases or the effectiveness of health measures. rate.
Over-acidification of the body (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.) increases the sensitivity of the heart muscle to digitalis glycosidesDigitalis glycosides are active ingredients obtained from foxglove (Digitalis) that strengthen heart function by increasing the contractile force of the heart muscle. They are used in dogs and cats to treat certain heart conditions..
Hypotension is initially addressed with volume replacement, and atropine is indicated in cases of pronounced bradycardiaBradycardia refers to a slower than normal heart rate, typically below 60 beats per minute in adults. It can occur in healthy individuals, especially athletes, but can also be an indication of heart disease..
In some cases, intubation and ventilation may be necessary.
Seizures can be treated initially with standard medications (benzodiazepines, antispasmodics). If that is not sufficient, short-term intravenous anesthesiaAnesthesia refers to the state of insensitivity to pain and can be partial (local anesthesia) or for the entire body (general anesthesia). It is used to keep patients pain-free during surgical procedures. is required.
Prognosis & follow-up care
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. should be guarded. Severe poisonings are usually fatal. Before the introduction of digitalis antitoxin, the mortalityMortality is the death rate within a population over a specific period. It is often used to assess the severity of diseases or the effectiveness of health measures. rate in human medicine for intoxications with digitalis glycosidesDigitalis glycosides are active ingredients obtained from foxglove (Digitalis) that strengthen heart function by increasing the contractile force of the heart muscle. They are used in dogs and cats to treat certain heart conditions. was 20–30%.
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 yew poisoning is cautious to poor:
| Amount ingested | 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. |
| Small amounts + early 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. | Rather favorable |
| High dose + late intervention | Very unfavorable |
| Cardiac arrest | Mostly fatal |
Follow-up care: surviving animals must be monitored for at least 48–72 hours. Heart rate, circulation, and neurological functions must be closely monitored.
Research outlook
Research on yew poisoning in pets is still limited. Key goals:
- Development of a 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.
- Studies on 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. time and dose-response relationship
- Rapid toxicological tests for early detection
- Awareness campaigns about poisonous garden plants for pets
- Alternatives to yews in cemeteries and gardens
Frequently asked questions (FAQs)
1. Is yew poisonous to dogs and cats?
Yes – all parts except the red flesh of the fruit are 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..
2. How quickly does yew poison act?
Symptoms usually appear within 30–120 minutes.
3. What to do if my dog has eaten yew needles?
Seek emergency veterinary help immediately. Do not give home remedies.
4. What symptoms appear first?
Vomiting, weakness, tremors, slowed pulse.
5. Is there 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.?
No. Only 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. is possible.
6. Can my pet die without symptoms?
Yes, sudden cardiac death is possible.
7. How much yew is fatal?
Even 1–2 g of needles/kg body weight can be sufficient.
8. Are the red yew berries harmless?
Only the fruit flesh – the seed inside is poisonous.
9. Is recovery possible?
Yes, with early intervention and low intake.
10. How do I protect my pet?
Do not plant yews in the garden, be attentive when walking.
Literature
- http://www.gifte.de/Giftpflanzen/taxus_baccata.htm
- Bonjour, T., Varlet, V., Augsburger, M., Pagani, J. L., & Pantet, O. (2019, April). The yew—an ornamental conifer that can be fatal. In Swiss Medical Forum (Vol. 19, No. 1718, pp. 303–305). EMH Media.
- www.http://toxdocs.de/2019/digitalis/
- Gwaltney-Brant, S. (2012): Toxicology of Plants. In: Peterson, M.E.; Talcott, P.A. (eds.): Small Animal Toxicology, 3rd ed., Elsevier, pp. 378–403.
- Cope, R.B. (2005): Taxus spp. poisoning in animals. In: Gupta, R. (ed.): Veterinary Toxicology, Academic Press, pp. 501–506.
- Knight, A., Walter, R. (2001): A Guide to Poisonous House and Garden Plants. Teton NewMedia.
- Cortinovis, C.; Caloni, F. (2013): Plants Poisonous to Dogs and Cats: A Review. Toxins, 5(6), 1171–1192.
- Dorman, D.C. (2000): Taxine alkaloid toxicosis in domestic animals. Vet Hum Toxicol, 42(4), 247–251.
- Löwe G, Löwe O. Poisonings in Dogs and Cats – A Veterinary Guide. 2nd Edition. Kreuztal: Kynos-Verlag. 2021; 208 p.