Pet Food Allergen
Egg Allergy in Dogs and Cats
Egg allergies in pets target the egg white — specifically ovalbumin, ovomucoid, and conalbumin proteins. Egg yolk alone is rarely problematic. Dogs with a chicken allergy often react to whole egg through cross-reactivity with chicken serum albumin.
Prevalence
~4-8% of food-allergic dogs react to egg (Mueller 2016). Cats less frequently.
Label names that contain egg
Any of these on an ingredient list means egg is present.
Cross-reactivity
A pet allergic to egg may also react to: chicken (serum albumin). Cross-reactivity is not guaranteed, but it is common enough that it should inform an elimination diet.
Symptoms that point to egg
In-depth guides
Common questions
Why do dogs with chicken allergy often react to eggs?
Cross-reactivity through chicken serum albumin. Eggs contain ovomucoid and ovalbumin proteins that share structural similarity with chicken muscle proteins. Roughly half of chicken-allergic dogs also react to whole egg. Egg yolk alone carries almost none of the reactive proteins — the white is where most sensitisation targets live — but whole egg or "egg product" on a label includes both.
Can my egg-allergic dog eat egg yolk only?
Often yes. Almost all egg allergy reactions target egg white proteins (ovalbumin, ovomucoid, conalbumin, lysozyme). Egg yolk contains different proteins that rarely trigger reactions. Some raw-feeding protocols intentionally feed yolk-only for this reason. That said, home-separated egg will carry trace white; tolerance varies per dog, so introduce cautiously.
How is egg allergy diagnosed in pets?
Same workhorse as any food allergy: an 8–12 week elimination diet with a confirmed egg-free (and chicken-free, given cross-reactivity) novel-protein formula, followed by a single-ingredient egg challenge to confirm. Blood and saliva tests sit at 50–70% accuracy — close to coin-flip. Elimination-and-challenge remains the diagnostic gold standard at ~85% accuracy.
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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.