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Understanding Canine and Feline Allergies: Causes, Symptoms, and Treatment

Aug 28, 2023 | Behavioural, Cats, Dogs, Nutrition, Parasites, Pet Care, Pet Safety, Pet Tips, Wellness

Allergies are a common health concern among both dogs and cats, affecting their overall well-being and quality of life. Just like humans, pets can experience allergic reactions to various substances in their environment or diet. This article provides an overview of canine and feline allergies, including their causes, symptoms, and treatment options.

Causes of Allergies in Dogs and Cats

Allergies in dogs and cats can be triggered by a wide range of allergens, which are substances that provoke an immune response. The most common allergens for pets include:

  • Environmental Allergens: These include pollen, mold spores, dust mites, and grasses. Exposure to these allergens can lead to seasonal allergies in pets.
  • Flea Allergy Dermatitis: Some animals are hypersensitive to flea saliva. Even a single flea bite can trigger severe itching and discomfort.
  • Food Allergies: Dogs and cats can develop allergies to certain ingredients in their food, such as proteins like chicken or beef, or grains like wheat or corn.
  • Contact Allergens: These can include substances like certain plants, household cleaners, or fabrics that come into direct contact with a pet’s skin.
  • Medications: Some pets may be allergic to certain medications, particularly antibiotics or non-steroidal anti-inflammatory drugs (NSAIDs).

Symptoms of Allergies in Dogs and Cats

The symptoms of allergies in dogs and cats can vary, but common signs to look for include:

  • Itching and Scratching: Persistent itching, especially around the ears, paws, and face, is a hallmark symptom of allergies in pets.
  • Skin Irritation: Allergic reactions often result in skin redness, inflammation, and the development of hot spots or rashes.
  • Ear Infections: Pets with allergies are prone to ear infections, which can cause ear scratching, head shaking, and foul-smelling discharge.
  • Gastrointestinal Issues: Food allergies may lead to vomiting, diarrhea, or other digestive problems.
  • Respiratory Symptoms: Pets exposed to environmental allergens may exhibit sneezing, coughing, or nasal discharge.
  • Hair Loss: Allergic reactions can cause pets to lose hair in localized areas.

Diagnosis and Treatment

If you suspect your dog or cat has allergies, it’s essential to consult with a veterinarian for proper diagnosis and treatment. The diagnostic process may include:

  • History and Physical Examination: Your vet will ask about your pet’s symptoms and conduct a physical exam.
  • Allergy Testing: This can include skin tests, blood tests, or elimination diets to identify specific allergens.

Treatment options for allergies in pets can vary depending on the cause and severity of the allergic reaction:

  • Allergen Avoidance: When possible, avoiding exposure to known allergens is the first line of defense.
  • Medications: Antihistamines, corticosteroids, and immunosuppressive drugs may be prescribed to alleviate symptoms.
  • Allergy Injections (Immunotherapy): For pets with severe allergies, allergen-specific immunotherapy can help build tolerance to the allergens over time.
  • Dietary Changes: Switching to a hypoallergenic diet or a novel protein source can manage/diagnose food allergies.
  • Flea Control: Preventing fleas through regular treatments is essential for pets with flea allergies.


Canine and feline allergies are common and can significantly impact the health and comfort of your pets. Identifying the underlying cause of your pet’s allergies and working closely with a veterinarian to develop a treatment plan is crucial for managing these conditions. With proper care and management, many pets with allergies can lead happy and healthy lives.

If you have any questions after reading this article please feel welcome to reach out to our friendly fear free certified staff anytime! We would be more than happy to assist you in learning more, please call us at 519-893-8937 or send us an email at [email protected]