Ingredient file // Flavor
Hydrolyzed Chicken Flavor
A useful flavor with an allergy caveat
Hydrolyzed chicken flavor is made from chicken tissue whose proteins have been broken into smaller pieces. Its job is to make food more appealing to dogs. The word hydrolyzed does not guarantee safety for a dog with a chicken allergy.
- What it is
- A chicken-derived flavor made by breaking tissue proteins into smaller peptides and soluble material.
- Made from
- Chicken tissue, sometimes including liver
- Main job
- Make food more appealing
- Typical amount
- 0.7 to 1% in a published kibble coating test
- Watch for
- A diagnosed chicken allergy
- Not the same as
- Chicken fat
Our read // In our catalog
In 1 of every 152 foods we track
Share of foods that list it
1%
15 of the 2,282 foods we track, from 1 brand. 10 dry dog food, 5 wet dog food.
Each square is 1% of the catalog
Where it sits on the label
Median position 10. In the top five of 0 foods, so it is usually a supporting ingredient.
Above the salt
Almost always listed before the salt, so there is more of it than a pinch.
Price per lb
Median of the cheapest bag price across 10 priced foods, 19% above the catalog. The price is the food's, not the ingredient's.
Who leans on it
100%
of the foods that list it are from Hill's. 1 brand use it in total.
What it is
How it is made
Chicken processing leaves tissue after retail cuts are removed. Flavor producers use enzymes to break proteins in that tissue into smaller pieces, creating a savory liquid that may be dried for pet food.4,5,6
- 01 // Source Chicken tissue Remaining carcass tissue or organs such as liver provide protein for the flavor ingredient.
- 02 // Process Enzymes added Protease enzymes break larger chicken proteins into smaller peptides and release soluble material.
- 03 // Process Solids separated Filtering can remove insoluble material and much of the fat from the liquid hydrolysate.
- 04 // Output Liquid or powder The hydrolysate reaches a pet food plant as a liquid flavor or a dried powder for coating kibble.
What is in it
Composition, dry matter
52-68
% protein
Two experimental chicken carcass hydrolysates spanned this range before and after filtration. Their composition does not specify the protein in every commercial flavor.
Why it is in the bag
What the manufacturer gets
-
01
Improves food preference
Chicken liver hydrolysate changed which kibble dogs chose in manufacturer preference tests. The result depended on the recipe and the other ingredients used with it.5
-
02
Uses remaining chicken tissue
Chicken processing leaves carcass material after retail cuts are removed. Hydrolysis gives producers a flavor use for that lower-value stream.4
-
03
Needs a small coating
A manufacturer tested spray-dried hydrolyzed chicken at 0.7 to 1% of finished kibble. In its tests, the coating method affected how much palatant was needed.6
-
04
Adds flavor to kibble
A coating puts the hydrolysate on the outside of dry kibble, where a dog encounters it first. Producers can also mix liver hydrolysate into wet food.5,6
How much One manufacturer tested spray-dried hydrolyzed chicken coatings at 0.7, 0.8 and 1% of finished kibble.6
Our read // The claims
What the evidence supports
Strong: controlled studies in dogs agree. Some: small or mixed dog data. Thin: mechanism or lab work only. None: nothing, or the evidence points the other way.
-
Brands say
Chicken hydrolysate makes kibble more appealing
Evidence
- Strong
- Some
- Thin
- None
In manufacturer two-bowl tests with 25 dogs, chicken liver hydrolysate won in several recipes and lost in another. It is a useful palatant, but those tests do not show that every dog will prefer every food containing it.5
-
Brands say
This flavor improves a dog's gut health
Outruns the evidence
Evidence
- Strong
- Some
- Thin
- None
A 10-dog study found changes in some fecal measures when chicken hydrolysates supplied 5 or 25% of a diet. It did not test this flavor at a coating dose or show a health benefit from that dose.3,6
-
Owners say
Hydrolysis makes chicken safe for every allergic dog
Outruns the evidence
Evidence
- Strong
- Some
- Thin
- None
In a blinded trial, 4 of 10 chicken-allergic dogs had itching flares on a hydrolyzed chicken liver diet. Another small trial found fewer signs in 11 of 12 dogs fed hydrolyzed chicken. Neither tested this flavor by itself.1,2
-
Brands say
The flavor adds meaningful animal protein
Outruns the evidence
Evidence
- Strong
- Some
- Thin
- None
Experimental chicken hydrolysates contained about 52 to 68% protein on a dry basis, but a kibble coating test used hydrolyzed chicken at only 0.7 to 1% of the food. This line is not a main protein source.4,6
Straight answers
What owners ask
-
Q01
Is it just filler?
No, it's flavorIt has a job: making food more appealing. Chicken liver hydrolysate changed preference in dog tests, though results varied by recipe. Its small tested coating dose makes it a flavor addition, not a main nutrient source.5,6
-
Q02
Is it safe with chicken allergy?
Not guaranteedThe label does not reveal the remaining peptide sizes or show that this particular flavor was tested in allergic dogs. A hydrolyzed chicken liver diet still caused itching flares in 4 of 10 dogs with proven chicken reactions.1
-
Q03
Does it count as chicken meat?
NoIt comes from chicken tissue, but the label identifies it as a flavor ingredient. Read the other ingredients and the food's nutrient analysis to judge its protein sources; this flavor line cannot tell you how much meat the recipe contains.4,7
Who uses it
Brands, best sellers and the company it keeps
Top brands, by foods that list it
Usually listed with, share of the foods that list it
- Dried Beet Pulp 67%
- Chicken Fat 60%
- Chicken 53%
- Brown Rice 53%
- Brewers Rice 47%
- Cracked Pearled Barley 47%
- Whole Grain Corn 40%
- Pork Liver 33%
- Corn Protein Meal 33%
- Pea Protein 33%
- Carrots 27%
- Chicken Meal 27%
Our read // On the bag
Read it as flavor and check the formula
Expect it below the main protein and starch ingredients, where a small flavor addition belongs. Look above it to see what supplies the food's protein and fat. For a dog with a diagnosed chicken allergy, judge the exact food with the clinician managing the diet trial; hydrolyzed alone is not a safety guarantee.
Sources
What we read
Checked October 1, 2026.
- 1 A randomized, double-blinded crossover trial testing the benefit of two hydrolysed poultry-based commercial diets for dogs with spontaneous pruritic chicken allergy
- 2 A comparison of the clinical manifestations of feeding whole and hydrolysed chicken to dogs with hypersensitivity to the native protein
- 3 The effects of hydrolyzed protein on macronutrient digestibility, fecal metabolites and microbiota, oxidative stress and inflammatory biomarkers, and skin and coat quality in adult dogs
- 4 Enzymatic hydrolysis of minced chicken carcasses for protein hydrolysate production
- 5 Methods For Enhancing Palatability of Compositions for Animal Consumption
- 6 Process for making a pet food in the form of a coated kibble
- 7 Reading Labels