Pet Food Allergen
Dairy Allergy in Dogs and Cats
Dairy reactions in pets split into two distinct categories: true protein allergy (immune-mediated, reacts to whey or casein) and lactose intolerance (enzyme deficiency, reacts to milk sugar). The symptoms overlap but the fix differs — lactose-free dairy is safe for the intolerant pet, not the allergic one.
Prevalence
~4-7% of food-allergic dogs react to dairy proteins (Mueller 2016). Lactose intolerance is far more common and largely age-related — most adult dogs produce reduced lactase.
Label names that contain dairy
Any of these on an ingredient list means dairy is present.
Cross-reactivity
A pet allergic to dairy may also react to: beef (rare — albumin cross-reactivity). Cross-reactivity is not guaranteed, but it is common enough that it should inform an elimination diet.
Symptoms that point to dairy
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Factual reference based on AAFCO ingredient definitions, FDA guidance, and peer-reviewed veterinary literature cited above. Not medical or veterinary advice. Consult a veterinarian for decisions about your pet's diet.