Food Allergies and Intolerances in Pets
Is your pet itchy year-round? A food allergy might be the cause. Learn how to identify and manage dietary sensitivities.
Food allergies in pets cause itchy skin, ear infections, and digestive upset. Unlike seasonal allergies, food allergies cause symptoms year-round. The most common triggers are proteins: beef, chicken, dairy, and wheat. Diagnosis requires a strict elimination diet trial. RVC can guide you through the process. Call +853 6677 6611.
Key Points
- Food allergies cause itchy skin, ear infections, and sometimes GI signs
- Beef, dairy, chicken, and wheat are the most common allergens
- Diagnosis requires an 8-12 week elimination diet trial
- Blood and skin tests for food allergy are unreliable in pets
- Hydrolyzed or novel protein diets are used for the trial
- Food intolerance (digestive upset) is different from true allergy (immune-mediated)
Signs of Food Allergy
The hallmark of food allergy is non-seasonal itching — your pet is itchy all year, not just in spring or fall. Common signs include: constant scratching, licking paws, ear infections (especially in dogs), red or inflamed skin, hair loss, and hot spots. Some pets also have digestive symptoms: vomiting, diarrhea, or frequent bowel movements. Cats may groom excessively, causing hair loss on the belly and sides.
The Elimination Diet Trial
This is the only reliable way to diagnose food allergy. For 8-12 weeks, your pet eats ONLY a prescription hydrolyzed protein diet or a novel protein diet (using proteins they've never eaten before, like kangaroo, rabbit, or venison). NO treats, table food, flavored medications, dental chews, or supplements unless vet-approved. If symptoms improve, the original diet is reintroduced. If symptoms return within 2 weeks, food allergy is confirmed.
Long-Term Management
Once allergens are identified, avoid them permanently. Options include: prescription hydrolyzed diets (proteins are broken down so small that the immune system doesn't react), limited ingredient diets with safe proteins, or home-cooked diets formulated by a veterinary nutritionist. Beware of over-the-counter 'limited ingredient' diets — cross-contamination is common. Prescription diets from your vet are the safest choice.
Food Intolerance vs Allergy
Food intolerance is a digestive issue without immune involvement. Signs: vomiting, diarrhea, gas, and bloating after eating certain foods. Lactose intolerance is common — many adult pets lose the ability to digest dairy. Food intolerance doesn't cause skin itching. Management involves avoiding the problematic ingredient. Unlike allergy, small amounts may be tolerated.
When to See a Vet Immediately
- Year-round itching that doesn't respond to flea treatment
- Chronic ear infections
- Digestive upset that correlates with specific foods
- Hair loss from excessive licking or scratching
- Skin infections that keep recurring
- Considering an elimination diet trial
How RVC Can Help
RVC provides dietary counseling and prescription elimination diets. If you suspect a food allergy, schedule a consultation at +853 6677 6611.
This article is for educational purposes only and does not replace professional veterinary advice. If your pet is showing any symptoms, please contact Royal Veterinary Center immediately at +853 6677 6611.