Allergy (Hypersensitivity Reaction) in Dogs
- Synonyms: Allergic Reaction
- Occurrence: common
- Location of disease: General/Whole body
When to visit the vet?
Non-urgent see a veterinarian within 2–3 days
If the condition worsens / symptoms persist, consult a veterinarian.
Definition
An allergyAn allergy is an overreaction of the immune system to a normally harmless substance, the allergen. The reaction can include symptoms such as skin rash, itching, sneezing, respiratory distress, or in severe cases, anaphylactic shock. in dogs is a hypersensitivity reaction of the immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. to certain substances that are normally harmless, such as pollen, food, or insect bites.
The most important facts at a glance
Allergies in dogs are common, 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. diseases with mostly dermatological and/or 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. They arise from an overreaction of the immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. to environmental or food antigens. 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. requires a systematic approach, 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. is multimodal and individually adaptable. Through early identification and management, a good quality of life can be achieved in most cases.
Causes
Allergies occur when a dog’s immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. overreacts to a normally harmless substance, known as an allergenAn allergen is a substance that can trigger an allergic reaction in sensitized individuals. These reactions vary in intensity and can range from mild symptoms to severe, life-threatening conditions.. The immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. mistakenly identifies this substance as a threat and initiates a cascade of reactions to combat it. These reactions involve the release of histamines and other chemical messengers that cause the typical allergyAn allergy is an overreaction of the immune system to a normally harmless substance, the allergen. The reaction can include symptoms such as skin rash, itching, sneezing, respiratory distress, or in severe cases, anaphylactic shock. symptoms.
The causes of allergies in dogs are diverse and can be genetically determined. Certain breeds are more susceptible to allergies, suggesting there may be a hereditary component. Commonly affected breeds include Labrador Retrievers, Golden Retrievers, West Highland White Terriers, and French Bulldogs.
Environmental factors also play a significant role. Dogs living in urban areas with higher levels of pollution appear to suffer more frequently from allergies. This could be due to the greater variety and quantity of potential allergens they are exposed to.
Food allergies are another common cause. These can be triggered by common proteins in dog food such as beef, chicken, or eggs. It is important to note that a food allergyAn allergy is an overreaction of the immune system to a normally harmless substance, the allergen. The reaction can include symptoms such as skin rash, itching, sneezing, respiratory distress, or in severe cases, anaphylactic shock. should not be confused with a food intolerance, as the mechanisms and symptoms are different.
Another important factor is parasites like fleas. The saliva of fleas can triggerA trigger is a stimulus that elicits a specific reaction or state. In veterinary medicine, this can refer to emotional responses, such as fear or aggression, or medical conditions, such as seizures in dogs and cats. an allergic reaction in some dogs, known as flea allergyAn allergy is an overreaction of the immune system to a normally harmless substance, the allergen. The reaction can include symptoms such as skin rash, itching, sneezing, respiratory distress, or in severe cases, anaphylactic shock. dermatitis. This reaction is often more intense than the reaction caused by the actual flea bite.
Symptoms
The symptoms of an allergyAn allergy is an overreaction of the immune system to a normally harmless substance, the allergen. The reaction can include symptoms such as skin rash, itching, sneezing, respiratory distress, or in severe cases, anaphylactic shock. in dogs can be diverse and depend on the type of allergyAn allergy is an overreaction of the immune system to a normally harmless substance, the allergen. The reaction can include symptoms such as skin rash, itching, sneezing, respiratory distress, or in severe cases, anaphylactic shock.. Skin problems are the most common signs and can include Itching, redness, Swelling, and rashes. Skin irritations often cause the dog to excessively Scratch, bite, or lick, which can lead to further skin damage and infections.
Dogs with allergies can also develop respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. symptoms such as Sneezing, Cough, or a runny nose. These symptoms are more common with environmental allergies, where pollen or mold are the triggers.
For food allergies, 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 such as Vomiting or DiarrheaDiarrhea refers to the condition of frequent, watery bowel movements, which can be a sign of infections, digestive disorders, or other health problems. often occur. These symptoms can appear in combination with skin symptoms, which can 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. difficult.
Ear Inflammatory conditions are also a common symptom and can manifest as head shaking, Scratching ears, or an unpleasant odor. RecurrentRecurrent refers to a disease that repeatedly returns or worsens after a temporary remission or improvement. ear Inflammatory conditions are often an 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 an underlying allergyAn allergy is an overreaction of the immune system to a normally harmless substance, the allergen. The reaction can include symptoms such as skin rash, itching, sneezing, respiratory distress, or in severe cases, anaphylactic shock..
In summary: The pattern of “Itching ± otitis externa ± recurrentRecurrent refers to a disease that repeatedly returns or worsens after a temporary remission or improvement. Skin infections” is highly suspicious for an allergyAn allergy is an overreaction of the immune system to a normally harmless substance, the allergen. The reaction can include symptoms such as skin rash, itching, sneezing, respiratory distress, or in severe cases, anaphylactic shock..
Diagnosis
The 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. of allergies in dogs is often a process of elimination, as there is no single test method that definitively confirms allergies. The veterinarian will first take a thorough 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 perform a physical examination.
An important step in the 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 ruling out other conditions that can cause similar symptoms, such as Skin infections or parasiticParasitic refers to diseases or conditions caused by parasites. Parasitic infections can affect the digestive tract, skin, and other organ systems. infestations. These can often be ruled out through laboratory tests, such as skin scrapings or blood tests.
Another diagnostic approach is performing allergyAn allergy is an overreaction of the immune system to a normally harmless substance, the allergen. The reaction can include symptoms such as skin rash, itching, sneezing, respiratory distress, or in severe cases, anaphylactic shock. tests. Intradermal skin tests, where small amounts of potential allergens are injected under the dog’s skin, can help identify environmental allergies. Blood tests are another option, especially if skin testing is not possible.
If a food allergyAn allergy is an overreaction of the immune system to a normally harmless substance, the allergen. The reaction can include symptoms such as skin rash, itching, sneezing, respiratory distress, or in severe cases, anaphylactic shock. is suspected, an 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. diet can be performed. This involves feeding the dog a novel or hydrolyzed proteinProteins are large molecules made up of amino acids and play an essential role in almost all biological processes. They are necessary for building body tissue, the function of the immune system, and as enzymes for metabolic reactions. source for a certain period to eliminate potential allergens from the diet. After this phase, the original foods are gradually reintroduced to determine which is the allergenAn allergen is a substance that can trigger an allergic reaction in sensitized individuals. These reactions vary in intensity and can range from mild symptoms to severe, life-threatening conditions..
Therapy
The therapy for allergies in dogs aims to alleviate symptoms and improve the animal’s quality of life. One of the most effective measures is avoiding the triggering allergenAn allergen is a substance that can trigger an allergic reaction in sensitized individuals. These reactions vary in intensity and can range from mild symptoms to severe, life-threatening conditions., although this is not always possible.
AntihistaminesAntihistamines are medications that block the effects of histamine in the body, thereby alleviating allergic reactions. They are used in dogs and cats to treat Itching, Skin inflammation, and other allergy symptoms. and corticosteroidsCorticosteroids are a class of steroid hormones that occur naturally in the body and can also be produced synthetically. They have anti-inflammatory and immunosuppressive properties and are used in veterinary medicine to treat a variety of conditions. are often used to reduce Itching and Inflammatory conditions. These medications are particularly useful 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. outbreaks but should be used with caution long-term, as they can have side effects.
For skin symptoms, special shampoos and lotions can be used to soothe the skin and promote healing. These products can also help prevent secondary Skin infections that may result from Scratching.
For dogs with severe or chronic allergies, immunotherapy may be considered. This 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., also known as allergyAn allergy is an overreaction of the immune system to a normally harmless substance, the allergen. The reaction can include symptoms such as skin rash, itching, sneezing, respiratory distress, or in severe cases, anaphylactic shock. vaccinationVaccination is the process of administering a vaccine to develop immunity against a specific infectious disease. It is one of the most effective methods of prevention of infectious diseases., consists of regular injections of small amounts of the allergen to gradually accustom the dog’s immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. to the allergenAn allergen is a substance that can trigger an allergic reaction in sensitized individuals. These reactions vary in intensity and can range from mild symptoms to severe, life-threatening conditions..
For food allergies, a long-term dietary change is necessary. This often means the dog must adhere to a special diet for life to avoid recurrentRecurrent refers to a disease that repeatedly returns or worsens after a temporary remission or improvement. allergic reactions.
Prognosis and follow-up care
The prognosis for dogs with allergies depends on the type and severity of the allergyAn allergy is an overreaction of the immune system to a normally harmless substance, the allergen. The reaction can include symptoms such as skin rash, itching, sneezing, respiratory distress, or in severe cases, anaphylactic shock.. In many cases, symptoms can be well controlled with appropriate therapy and management, allowing affected dogs to lead normal and happy lives.
However, it is important to note that allergies are generally a lifelong condition. This means that regular veterinary check-ups and adjustments to the 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. may be necessary to keep symptoms under control.
Untreated or poorly controlled allergies, however, 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. skin problems, ear Inflammatory conditions, or other health complications that can significantly impair the dog’s quality of life.
Prevention
The preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. of allergies in dogs can be a challenge, as many factors play a role. One of the most effective preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. strategies is minimizing contact with known allergens. This can be achieved through regular cleaning of the living area, use of air filters, and regular grooming.
Consistent flea control is crucial for dogs with a known flea allergyAn allergy is an overreaction of the immune system to a normally harmless substance, the allergen. The reaction can include symptoms such as skin rash, itching, sneezing, respiratory distress, or in severe cases, anaphylactic shock.. This can be achieved through the application of flea preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. products and regular cleaning of the dog’s environment.
A balanced diet, specifically tailored to the dog’s needs, can also help reduce the risk of food allergies. For dogs prone to allergies, a hypoallergenic diet may be considered.
Furthermore, regular veterinary examinations can help detect and treat allergies early, before they lead to serious health problems. Close cooperation with the veterinarian is key to effective preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. and therapy of allergies.
Outlook on current research
Research into allergies in dogs is a dynamic and expanding field that constantly provides new insights. A focus of current research is on the genetic predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases. for allergies. Scientists are investigating how certain breeds are more susceptible to allergic reactions and which genetic markers are associated with this. This research could help develop targeted breeding strategies in the future to minimize the risk of allergic diseases.
Another important research area is the development of new diagnostic methods. Traditionally, allergies in dogs are diagnosed through skin tests or blood tests. New techniques, such as molecular diagnostics and genome sequencing, 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. more precise and faster. Researchers are working to optimize these technologies to detect allergies earlier and more accurately.
Additionally, intensive research is being conducted on new 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. options. Currently, allergies are often treated with medications such as antihistaminesAntihistamines are medications that block the effects of histamine in the body, thereby alleviating allergic reactions. They are used in dogs and cats to treat Itching, Skin inflammation, and other allergy symptoms. or corticosteroidsCorticosteroids are a class of steroid hormones that occur naturally in the body and can also be produced synthetically. They have anti-inflammatory and immunosuppressive properties and are used in veterinary medicine to treat a variety of conditions., which alleviate symptoms but do not offer a cure. Therefore, alternative approaches such as immunotherapies or the development of vaccinations against specific allergens are being investigated in research. The focus here is on long-term modification of the dog’s immune responseAn immune response is the immune system's reaction to foreign substances (antigens), such as microorganisms or proteins. It involves a series of processes aimed at recognizing, fighting, and eliminating these antigens. to reduce sensitivity to allergens.
The environmental factors contributing to the development of allergies are also a central topic of research. Scientists are investigating how environmental changes and pollution affect the frequency and severity of allergies. These findings could help develop preventive measures to reduce the allergyAn allergy is an overreaction of the immune system to a normally harmless substance, the allergen. The reaction can include symptoms such as skin rash, itching, sneezing, respiratory distress, or in severe cases, anaphylactic shock. risk.
Overall, current research paints a promising picture for the future of allergyAn allergy is an overreaction of the immune system to a normally harmless substance, the allergen. The reaction can include symptoms such as skin rash, itching, sneezing, respiratory distress, or in severe cases, anaphylactic shock. 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. in dogs. Through the combination of genetic, diagnostic, and therapeutic approaches, it may be possible in the future not only to effectively treat symptoms but also to address the causes of allergies and significantly improve the lives of allergy-prone dogs.