Ten percent of all allergy cases in dogs are food allergies. Dogs also can suffer from food intolerance, which is different from a food allergy. And those are just numbers that are reported!
Anyway the allergies can flare up from either genetics and predisposition, to changes in environment. Typically, the more common the protein, the more often you see dogs being allergic to it. Most common allergies are from grains, soy, corn, chicken, beef and dairy.
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