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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.

Role in the food Does a job
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

Straight answer

Is Hydrolyzed Chicken Flavor safe for dogs?

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.

Why it is in the food
Make food more appealing

Our read // In our catalog

In 1 of every 100 foods we track

Share of foods that list it

<1%

32 of the 3,204 foods with an ingredient list on file, from 1 brand. 22 wet dog food, 10 dry dog food.

Each square is 1% of the catalog

Where it sits on the label

Median position 10.5. In the top five of 0 foods, so it is usually a minor ingredient.

Top five List position, heaviest first

Above the salt

100%

Almost always listed before the salt, so there is more of it than a pinch.

Price per lb

Foods with it $4.32
All foods $3.25

Median of the cheapest bag price across 10 priced foods, 33% 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

  1. 01 // Source Chicken tissue Remaining carcass tissue or organs such as liver provide protein for the flavor ingredient.
  2. 02 // Process Enzymes added Protease enzymes break larger chicken proteins into smaller peptides and release soluble material.
  3. 03 // Process Solids separated Filtering can remove insoluble material and much of the fat from the liquid hydrolysate.
  4. 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.

Crude protein 51.9-67.7%4
Crude fat 1.3-25.9%4
Ash 7.3-14.6%4

These figures come from experimental carcass hydrolysates, not a guaranteed analysis of this named flavor. Filtering removed fat and insoluble material, so processing alone changed the dry matter figures sharply.4

Why it is in the bag

There to make dogs eat it, not protein

  1. Main nutrition
  2. Supporting nutrient
  3. Does a job
  4. Mostly filler

Makers add it so dogs accept the food. A palatability patent notes that even a nutritious food is of little value if the animal refuses it, and its dog tests found chicken liver hydrolysate raised preference in several recipes. A kibble coating patent defines a palatant as something added mainly to improve acceptance. Labels list ingredients by weight, so every ingredient above it outweighs it; look there for the food's protein.5,6,7

  1. 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

  2. 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

  3. 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

  4. 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.

  1. Brands say

    Chicken hydrolysate makes kibble more appealing

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. 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

  2. Brands say

    This flavor improves a dog's gut health

    Outruns the evidence

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. 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

  3. Owners say

    Hydrolysis makes chicken safe for every allergic dog

    Outruns the evidence

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. 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

  4. Brands say

    The flavor adds meaningful animal protein

    Outruns the evidence

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. 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

  1. Q01

    Is it just filler?

    No, it's flavor

    It 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

  2. Q02

    Is it safe with chicken allergy?

    Not guaranteed

    The 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

  3. Q03

    Does it count as chicken meat?

    No

    It 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

  1. Hill's 32 / 116

Foods that list it / all the brand's recipes we track.

Usually listed with, share of the foods that list it

  1. Chicken 69%
  2. Pork Liver 63%
  3. Carrots 59%
  4. Rice 50%
  5. Dried Beet Pulp 41%
  6. Rice Starch 41%
  7. Chicken Broth 38%
  8. Water 28%
  9. Chicken Fat 28%
  10. Corn Starch 25%
  11. Green Peas 25%
  12. Soybean Oil 25%

On the shelf

Foods that list Hydrolyzed Chicken Flavor

32 foods in our catalog list it, highest on the label first.

Hill’s Prescription Diet i/d Puppy Turkey Digestive Care Wet Dog FoodHill'sHill’s Prescription Diet i/d Puppy Turkey Digestive Care Wet Dog FoodWet // No. 7 on the labelHill’s Puppy Chicken & Barley Entrée Wet Dog FoodHill'sHill’s Puppy Chicken & Barley Entrée Wet Dog FoodWet // No. 7 on the label
Show 30 more
Hill’s Prescription Diet k/d + Mobility Kidney + Joint Care Chicken Flavor Dry Dog FoodHill'sHill’s Prescription Diet k/d + Mobility Kidney + Joint Care Chicken Flavor Dry Dog FoodDry // No. 7 on the labelHill’s Prescription Diet Derm Complete Original Flavor Dry Dog FoodHill'sHill’s Prescription Diet Derm Complete Original Flavor Dry Dog FoodDry // No. 7 on the labelHill’s Science Diet Puppy Small & Mini Beef & Barley Entrée Wet Dog FoodHill'sHill’s Science Diet Puppy Small & Mini Beef & Barley Entrée Wet Dog FoodWet // No. 8 on the labelHill’s Prescription Diet z/d Skin/Food Sensitivities Small Bites Original Flavor Dry Dog FoodHill'sHill’s Prescription Diet z/d Skin/Food Sensitivities Small Bites Original Flavor Dry Dog FoodDry // No. 8 on the labelHill’s Prescription Diet w/d Multi-Benefit Vegetable & Chicken Stew Wet Dog FoodHill'sHill’s Prescription Diet w/d Multi-Benefit Vegetable & Chicken Stew Wet Dog FoodWet // No. 9 on the labelHill’s Science Diet Adult Perfect Digestion Chicken & Rice Entrée Wet Dog FoodHill'sHill’s Science Diet Adult Perfect Digestion Chicken & Rice Entrée Wet Dog FoodWet // No. 9 on the labelHill’s Science Diet Adult Large Breed Lamb Meal & Brown Rice Recipe Dry Dog FoodHill'sHill’s Science Diet Adult Large Breed Lamb Meal & Brown Rice Recipe Dry Dog FoodDry // No. 9 on the labelHill’s Science Diet Adult 7+ Healthy Cuisine Braised Beef, Carrots & Peas Stew Wet Dog FoodHill'sHill’s Science Diet Adult 7+ Healthy Cuisine Braised Beef, Carrots & Peas Stew Wet Dog FoodWet // No. 10 on the labelHill’s Prescription Diet ONC Care Chicken & Vegetable Stew Wet Dog FoodHill'sHill’s Prescription Diet ONC Care Chicken & Vegetable Stew Wet Dog FoodWet // No. 10 on the labelHill’s Science Diet Puppy Chicken & Rice Stew Wet Dog FoodHill'sHill’s Science Diet Puppy Chicken & Rice Stew Wet Dog FoodWet // No. 10 on the labelHill’s Science Diet Adult Healthy Cuisine Chicken & Vegetables Stew Wet Dog FoodHill'sHill’s Science Diet Adult Healthy Cuisine Chicken & Vegetables Stew Wet Dog FoodWet // No. 10 on the labelHill’s Science Diet Adult Perfect Digestion Small & Mini Chicken & Vegetables Entrée Wet Dog FoodHill'sHill’s Science Diet Adult Perfect Digestion Small & Mini Chicken & Vegetables Entrée Wet Dog FoodWet // No. 10 on the labelHill’s Science Diet Puppy Large Breed Lamb Meal & Brown Rice Recipe Dry Dog FoodHill'sHill’s Science Diet Puppy Large Breed Lamb Meal & Brown Rice Recipe Dry Dog FoodDry // No. 10 on the labelHill’s Science Diet Puppy Chicken Meal & Barley Recipe Dry Dog FoodHill'sHill’s Science Diet Puppy Chicken Meal & Barley Recipe Dry Dog FoodDry // No. 10 on the labelHill’s Adult Healthy Cuisine Roasted Chicken, Carrots & Spinach Stew Wet Dog FoodHill'sHill’s Adult Healthy Cuisine Roasted Chicken, Carrots & Spinach Stew Wet Dog FoodWet // No. 11 on the labelHill’s Prescription Diet Gastrointestinal Biome Wet Dog FoodHill'sHill’s Prescription Diet Gastrointestinal Biome Wet Dog FoodWet // No. 11 on the labelHill’s Science Diet Puppy Sensitive Stomach & Skin Salmon & Brown Rice Recipe Dry Dog FoodHill'sHill’s Science Diet Puppy Sensitive Stomach & Skin Salmon & Brown Rice Recipe Dry Dog FoodDry // No. 11 on the labelHill’s Science Diet Adult Sensitive Stomach & Skin Pollock Meal & Insect Recipe Dry Dog FoodHill'sHill’s Science Diet Adult Sensitive Stomach & Skin Pollock Meal & Insect Recipe Dry Dog FoodDry // No. 11 on the labelHill’s Science Diet Adult 7+ Chicken & Brown Rice Recipe No Corn, Wheat, Soy Dry Dog FoodHill'sHill’s Science Diet Adult 7+ Chicken & Brown Rice Recipe No Corn, Wheat, Soy Dry Dog FoodDry // No. 11 on the labelHill’s Science Diet Adult Perfect Weight & Joint Support Large Breed Chicken & Brown Rice Recipe Dry Dog FoodHill'sHill’s Science Diet Adult Perfect Weight & Joint Support Large Breed Chicken & Brown Rice Recipe Dry Dog FoodDry // No. 12 on the labelHill’s Science Diet Adult Perfect Weight Hearty Vegetable & Chicken Stew Wet Dog FoodHill'sHill’s Science Diet Adult Perfect Weight Hearty Vegetable & Chicken Stew Wet Dog FoodWet // No. 13 on the labelHill’s Science Diet Adult Sensitive Stomach & Skin Chicken & Vegetable Entrée Wet Dog FoodHill'sHill’s Science Diet Adult Sensitive Stomach & Skin Chicken & Vegetable Entrée Wet Dog FoodWet // No. 14 on the labelHill’s Science Diet Adult 7+ Senior Vitality Small & Mini Chicken & Vegetable Stew Wet Dog FoodHill'sHill’s Science Diet Adult 7+ Senior Vitality Small & Mini Chicken & Vegetable Stew Wet Dog FoodWet // No. 14 on the labelHill’s Science Diet Puppy Small & Mini Savory Stew with Chicken & Vegetables Wet Dog FoodHill'sHill’s Science Diet Puppy Small & Mini Savory Stew with Chicken & Vegetables Wet Dog FoodWet // No. 15 on the labelHill’s Science Diet Adult Sensitive Stomach & Skin Salmon & Vegetable Entrée Wet Dog FoodHill'sHill’s Science Diet Adult Sensitive Stomach & Skin Salmon & Vegetable Entrée Wet Dog FoodWet // No. 15 on the labelHill’s Science Diet Adult 7+ Savory Stew with Beef and Vegetables Wet Dog FoodHill'sHill’s Science Diet Adult 7+ Savory Stew with Beef and Vegetables Wet Dog FoodWet // No. 16 on the labelHill’s Science Diet Puppy Savory Stew with Chicken & Vegetables Wet Dog FoodHill'sHill’s Science Diet Puppy Savory Stew with Chicken & Vegetables Wet Dog FoodWet // No. 17 on the labelHill’s Hill’s Science Diet Adult 7+ Savory Stew with Chicken & Vegetables Wet Dog FoodHill'sHill’s Hill’s Science Diet Adult 7+ Savory Stew with Chicken & Vegetables Wet Dog FoodWet // No. 17 on the labelHill’s Science Diet Adult Savory Stew with Chicken & Vegetables Wet Dog FoodHill'sHill’s Science Diet Adult Savory Stew with Chicken & Vegetables Wet Dog FoodWet // No. 17 on the labelHill’s Hill’s Science Diet Adult Savory Stew with Beef & Vegetables Wet Dog FoodHill'sHill’s Hill’s Science Diet Adult Savory Stew with Beef & Vegetables Wet Dog FoodWet // No. 18 on the label

Sources

What we read

Checked October 1, 2026.

  1. 1 A randomized, double-blinded crossover trial testing the benefit of two hydrolysed poultry-based commercial diets for dogs with spontaneous pruritic chicken allergy Veterinary Dermatology, 2016 // Journal
  2. 2 A comparison of the clinical manifestations of feeding whole and hydrolysed chicken to dogs with hypersensitivity to the native protein Veterinary Dermatology, 2010 // Journal
  3. 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 Journal of Animal Science, 2024 // Journal
  4. 4 Enzymatic hydrolysis of minced chicken carcasses for protein hydrolysate production Poultry Science, 2023 // Journal
  5. 5 Methods For Enhancing Palatability of Compositions for Animal Consumption Google Patents, 2008 // Industry
  6. 6 Process for making a pet food in the form of a coated kibble Google Patents, 2011 // Industry
  7. 7 Reading Labels AAFCO, n.d. // Regulator
An ingredient on its own tells you very little. What matters is how much of it there is and where it sits in the list. That is why we weigh the top five rather than reacting to any single name further down. Back to the wiki

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