Pet Health

What are dog allergies or hypersensitivities?

Discover what dog allergies and hypersensitivities are, their symptoms, common triggers, and effective treatments to keep your furry friend healthy and happy!
Author: Veterinary Team
Dial A Vet
Updated
June 6, 2025
|
Published
June 6, 2025
Brown dog scratching its ear in a grassy field, illustrating signs of dog allergies and hypersensitivities.

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Does your dog seem to scratch endlessly, sneeze more often than usual, or develop irritated skin? These could be signs of allergies or hypersensitivities. Just like humans, dogs can develop allergies to a range of triggers, from food ingredients to environmental allergens. The good news is that with the right guidance, you can help your dog find relief and live comfortably.

⚠️ What to Watch For

Dog allergies can manifest in a variety of ways, and recognizing the symptoms early is key to getting your pet the care they need. Symptoms may vary depending on the type of allergy, but here are some common signs to look out for:

  • Excessive scratching, licking, or chewing, especially on paws, ears, or belly
  • Red, inflamed, or scaly skin
  • Frequent ear infections or head shaking
  • Watery eyes or nasal discharge
  • Chronic sneezing or coughing
  • Vomiting or diarrhea
  • Hair loss or bald patches

If your dog shows any of these symptoms persistently, it’s worth investigating further. Left untreated, allergies can lead to more serious issues like skin infections or chronic discomfort.

🔍 Possible Causes

Dogs can develop allergies to a wide range of substances. These can be grouped into three main categories: environmental allergens, food allergies, and flea allergies. Here’s a closer look at each:

Environmental Allergens: These are substances in your dog’s surroundings that trigger an allergic reaction. Common culprits include pollen, mold, dust mites, and grass. Dogs with environmental allergies may experience seasonal symptoms, much like humans with hay fever.

Food Allergies: Some dogs are hypersensitive to specific proteins or ingredients in their food. Common triggers include beef, chicken, dairy, wheat, and soy. Food allergies often cause skin irritation and gastrointestinal upset.

Flea Allergies: Flea allergy dermatitis is one of the most common allergic reactions in dogs. It occurs when a dog is allergic to the saliva of fleas, causing intense itching even after just one or two bites.

Other less common triggers include certain cleaning products, perfumes, or fabrics. Identifying the cause of your dog’s allergy is the first step toward finding an effective treatment plan.

✅ What You Can Do at Home

If you suspect your dog has allergies, there are several steps you can take at home to manage their symptoms and provide relief:

  • Regular grooming: Bathing your dog with a hypoallergenic or medicated shampoo can help soothe irritated skin and remove allergens from their coat.
  • Flea prevention: Use vet-approved flea control products year-round to prevent flea infestations and reduce the risk of flea allergy dermatitis.
  • Dietary changes: If food allergies are suspected, work with your vet to implement an elimination diet. This involves feeding your dog a novel protein or hydrolyzed diet to pinpoint the offending ingredient.
  • Clean environment: Regularly wash your dog’s bedding and vacuum your home to minimize exposure to dust mites, pollen, and other environmental allergens.
  • Skin care: Use vet-recommended topical treatments or sprays to calm inflamed skin and reduce itching.

While these steps can help alleviate mild symptoms, severe or persistent allergies should always be addressed with professional veterinary care.

💡 When to Call a Vet

Some allergic reactions require immediate medical attention, especially if your dog is experiencing severe symptoms like swelling, difficulty breathing, or hives. These could indicate anaphylaxis, a life-threatening condition that requires emergency care.

In less urgent cases, you should still consult a veterinarian if:

  • Your dog’s symptoms persist or worsen despite home care
  • They develop open sores, secondary infections, or hair loss
  • You suspect a food allergy and need guidance on an elimination diet
  • Your dog experiences chronic ear infections or gastrointestinal upset

Your vet may recommend allergy testing, prescribe medications such as antihistamines, or suggest a long-term treatment plan like immunotherapy. Getting professional advice is the best way to ensure your dog’s allergies are properly managed.

FAQs

Q: How are allergies diagnosed in dogs?
A: Diagnosing allergies typically involves ruling out other conditions and identifying triggers through methods like elimination diets, skin testing, or blood tests. Your vet will guide you through the best approach for your dog.

Q: Can I give my dog human allergy medications?
A: Some human antihistamines, like Benadryl, are safe for dogs in specific doses, but you should always consult your vet before administering any medication. Dosage varies by weight and health status.

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References

While every effort is made to ensure the accuracy of this content - including vet review where applicable - this article is for informational purposes only and is not a substitute for professional veterinary advice, diagnosis, or treatment. If your pet is unwell or you are concerned, please speak with a licensed veterinarian. You can book a $49 online consultation with our veterinary team  😄
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