Recurring itchy skin, ear infections, or digestive upset sometimes trace back to food. Here’s how food sensitivities are actually identified in dogs and cats — and how to compare foods once you know what to avoid.
Set up your pet’s sensitivity profile
A food allergy involves the immune system reacting to a protein — commonly proteins like beef, dairy, or chicken, not grains. A food intolerance is a digestive reaction without immune involvement. The signs can look similar (skin issues, GI upset), and both are far less common than owners often assume — environmental allergies are more frequent culprits for itching.
Blood, saliva, and hair tests for pet food allergies are widely sold and poorly supported by evidence. The diagnostic standard is an elimination diet: 8–12 weeks on a diet with a novel or hydrolyzed protein, with nothing else — no treats, no table food — followed by a deliberate re-challenge. This should be run with your veterinarian; doing it loosely usually produces no usable answer.
Once you know (or suspect) which ingredients your pet reacts to, add them to your pet’s profile. When you scan or search a food, we check the ingredient list against your pet’s sensitivities and flag matches — including the less obvious places a protein can hide in an ingredient list. It turns label-reading from a chore into a two-second check.
Studies most often implicate common proteins: beef, dairy, and chicken in dogs; beef, fish, and chicken in cats. Grain allergies are comparatively uncommon in both species.
Usually not by itself — most confirmed food allergies are to animal proteins, not grains. Identifying the actual trigger with your vet beats guessing at categories.
Typically 8–12 weeks of strict feeding before results are meaningful, followed by a re-challenge to confirm. Your veterinarian will set the protocol.
This page is for general informational purposes and is not veterinary advice. Always consult your veterinarian about your pet’s diet and health.