Pet Food Ingredient
Hydrolyzed Chicken
Chicken protein enzymatically broken down into fragments too small to trigger most allergic reactions. Used in veterinary Rx hypoallergenic diets (e.g. Hill's z/d, Royal Canin Hydrolyzed Protein HP).
Also labelled as
Source
Enzymatic hydrolysis of chicken liver or muscle — cleaves peptide bonds to reduce protein fragments below ~5,000 Daltons, the size threshold most IgE antibodies recognise.
Regulatory status
Classified as a processed animal protein; specific Rx-diet formulations require veterinary authorisation at the retail level.
Key notes
- —Effective for roughly 90% of food-allergic dogs per controlled feeding trials. Not 100% — the remaining ~10% react to fragments large enough that hydrolysis is incomplete.
- —Extensive hydrolysis (fragments <1,000 Da) is more effective than partial hydrolysis but also more expensive and less palatable. Different Rx brands use different hydrolysis depths.
Common alternatives
In-depth guides
Common questions
Is hydrolyzed chicken safe for chicken-allergic dogs?
For roughly 90% of chicken-allergic dogs, yes. Hydrolysis breaks chicken protein into peptide fragments typically under 5,000 Daltons — too small to trigger most IgE-mediated allergic responses. The remaining 10% react to larger residual fragments that incomplete hydrolysis leaves intact. Hill's z/d uses chicken liver hydrolysate and is one of the most widely-prescribed Rx hypoallergenic diets for exactly this reason.
Is hydrolyzed protein food worth the price?
For confirmed food-allergic dogs where retail LID hasn't resolved symptoms, yes. Rx hydrolyzed diets run $80-150 per bag and require vet authorisation — significantly more expensive than OTC LID formulas. The hit rate on food-allergy diagnosis is ~90% versus ~50-70% for retail LID, which saves months of elimination-diet retry cost and vet-visit fees for most cases.
Is this ingredient in your pet's food?
Scan the label. If it contains hydrolyzed chicken or any of the alternative names above, the scanner will flag it against your pet's allergen profile.
Scan a label →This entry is factual reference. It is not medical or veterinary advice. Consult a veterinarian for any decisions about your pet's diet.