Dog food allergies are commonly diagnosed but often misidentified. A dog with loose stools, itchy skin, or recurrent ear infections isn't necessarily allergic to their food — but diet can absolutely be a contributing factor, and ruling it out properly requires a specific process.
A true food allergy involves an immune system response to a specific protein antigen. Food intolerance is a non-immune digestive reaction (like lactose intolerance). Food sensitivity is a broader, less defined term. All three can cause symptoms, but true allergies and intolerances are what we're actually diagnosing in most dogs.
The only reliable diagnostic method: feed a novel protein (one the dog has never eaten) exclusively for 8–12 weeks, with zero treats, flavourings, or supplements. Then reintroduce one ingredient at a time. If symptoms return, you've found your allergen.
Good novel protein options: venison, kangaroo, rabbit, duck, or fish — depending on what your dog has previously eaten.
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