Food allergies affect approximately 10–15% of cats with allergic skin disease, and the only reliable diagnostic method is an 8–12 week elimination diet trial using a novel protein or hydrolyzed diet. Blood and saliva allergy tests are widely available but have low sensitivity and specificity for food allergies, according to the ACVD (American College of Veterinary Dermatology).
What Are the Signs of Food Sensitivities in Cats?
- Skin symptoms — Itching (especially head and neck), hair loss, scabs, over-grooming
- GI symptoms — Chronic vomiting, diarrhea, flatulence, soft stools
- Ear infections — Recurring otitis, especially when environmental causes are ruled out
- Non-seasonal symptoms — Year-round issues suggest food rather than environmental allergies
How Does an Elimination Diet Work?
An elimination diet uses a single novel protein (one your cat has never eaten before) or a hydrolyzed diet for 8–12 weeks. During this period, the cat eats nothing else — no treats, table scraps, or flavored medications. If symptoms improve, individual proteins are reintroduced one at a time to identify the specific trigger.
What Are Common Novel Proteins for Cats?
- Venison — Rarely used in commercial cat food
- Rabbit — Highly digestible and uncommon in most diets
- Duck — Less common protein source for cats
- Kangaroo — Available in some specialty diets
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