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Ingredient file // Flavor

Natural Fish Flavors

Printed as “Natural Fish Flavor” on some labels. Same ingredient.

A taste addition, not a fish serving

Natural fish flavors are fish-derived substances added mainly for smell and taste. A tested salmon hydrolysate made kibble more appealing to dogs, but the label does not reveal the flavor formula or promise a useful amount of fish protein or oil.

What it is
Fish-derived flavoring material, such as an extract or protein hydrolysate, added chiefly for taste and aroma.
Made from
Fish or fish processing leftovers
Main job
Makes kibble more appealing
Typical amount
Not published
Watch for
Fish protein in allergy diets
Not the same as
Fish oil or fish meal

Our read // In our catalog

In 1 of every 125 foods we track

Share of foods that list it

1%

18 of the 2,250 foods we track, from 7 brands. 17 dry dog food, 1 wet dog food.

Each square is 1% of the catalog

Where it sits on the label

Median position 10.5. In the top five of 1 food, 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 $4.07
All foods $3.24

Median of the cheapest bag price across 14 priced foods, 26% above the catalog. The price is the food's, not the ingredient's.

Who leans on it

33%

of the foods that list it are from Wellness. 7 brands use it in total.

What it is

How it is made

Fish processing leaves heads, skin and other usable material after products are prepared for people. One documented route turns that material into a protein hydrolysate for pet food. The process behind any particular bag's flavor entry is undisclosed.2

  1. 01 // Source Fish material A studied hydrolysate used heads, tails, skin and other fish material from processing.
  2. 02 // Process Enzymes added Enzymes broke down protein in the minced fish into smaller pieces.
  3. 03 // Process Solids removed Filtering removed scales and bones; centrifuging separated oil and minerals from the protein-rich liquid.
  4. 04 // Output Dried hydrolysate The concentrated liquid was spray dried before use in the studied kibble.

What is in it

Composition, dry matter

84

% protein

The average for a dried fish soluble concentrate. It shows what one possible flavor material contains, not what this entry guarantees.

Crude protein 75.6-89.9%4
Ash 5.5-9.6%4
Calcium 0.9-7.4 g/kg4

These ranges describe dried, defatted fish solubles, not a standard recipe for natural fish flavors. A liquid hydrolysate or extract could differ, and the bag does not disclose its analysis.4,8

Why it is in the bag

What the manufacturer gets

  1. 01

    Encourages eating

    Fish-derived compounds add smell and taste. Dogs preferred one salmon hydrolysate diet over its control, while another fish hydrolysate diet tied a shrimp-flavored comparison.1,2

  2. 02

    Uses processing leftovers

    Heads, skin and other fish material become a saleable ingredient after filleting. That gives processors another use for the material; a price advantage over other flavors has not been shown.2

How much A dog trial used 5% fish hydrolysate as a diet ingredient; it does not tell us how much flavor a commercial bag holds.2

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

    Fish flavor makes kibble more appealing

    Outruns the evidence

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. None

    In one dog choice test, a diet with 10% salmon hydrolysate took 73% of intake against its control. A separate 12-dog test found a near-even split between fish and shrimp hydrolysate diets. Appeal depends on the recipe.1,2

  2. Brands say

    Natural fish flavor makes the food safer

    Outruns the evidence

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. None

    AAFCO says the natural designation makes no safety promise. A 12-dog fish hydrolysate trial assessed short-term feeding, not whether natural flavorings are safer than other flavorings or whether every supplier's material is safe.2,5

  3. Brands say

    Fish flavor delivers omega-3 health benefits

    Outruns the evidence

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. None

    A dog trial changed fish hydrolysate and fish oil together, including 3.2% fish oil in the test diet. It cannot assign blood fatty acid changes to the hydrolysate. The flavor entry gives no omega-3 amount.2,8

  4. Owners say

    A little fish flavor cannot affect an allergic dog

    Outruns the evidence

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. None

    In controlled challenges of 11 dogs with known food reactions, fish protein triggered 7 reactions. The study did not test flavoring amounts, so it gives no safe dose for a dog known to react to fish.3

  5. Critics say

    Fish flavors are empty filler

    Outruns the evidence

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. None

    Flavor is a real job: dogs chose the 10% salmon hydrolysate diet more often in one trial. That result does not make a flavoring entry evidence of substantial fish nutrition in the finished food.1,6,8

Straight answers

What owners ask

  1. Q01

    Is it just filler?

    No

    Its job is taste. A dog choice test found greater intake of a salmon hydrolysate diet, while another fish hydrolysate diet tied its comparison food. Neither result reveals how much fish flavor is in this bag.1,2

  2. Q02

    Does it mean more fish protein?

    No

    Fish hydrolysates contain protein, but flavorings are used chiefly for taste. Read the named fish or fish meal entries and the food's guaranteed analysis to judge its protein, not the flavor entry.4,6,8

  3. Q03

    Is natural fish flavor fish oil?

    No

    Fish oil is a separate ingredient. In one processing study, oil was separated from the protein-rich liquid used to make hydrolysate. A fish flavor entry gives no dependable omega-3 amount.2

  4. Q04

    Does fish flavored mean fish rich?

    No

    AAFCO allows a flavor description when a listed ingredient supplies that flavor; it does not require a large amount. The ingredient list, ordered by weight, shows which fish ingredients carry more of the recipe.6,7

Who uses it

Brands, best sellers and the company it keeps

Top brands, by foods that list it

  1. Wellness 6
  2. Acana 3
  3. NutriSource 3
  4. Stella & Chewy's 2
  5. Go! Solutions 2
  6. Zignature 1
  7. Orijen 1

Usually listed with, share of the foods that list it

  1. Salmon 61%
  2. Salmon Meal 56%
  3. Peas 44%
  4. Canola Oil 44%
  5. Flaxseed 39%
  6. Sunflower Oil 33%
  7. Tomato Pomace 33%
  8. Chickpeas 33%
  9. Whitefish Meal 28%
  10. Trout 28%
  11. Red Lentils 22%
  12. Dried Ground Potatoes 22%

On the shelf

Foods that list it

18 foods in our reviews list it. Here are some of them.

Zignature Inception Fish Recipe Food Can Wet Dog Food27.3% protein
Show 17 more Orijen Wild Reserve, Wild-Caught Fish Recipe Dry Dog Food45.5% proteinStella & Chewy’s Wild Red : Whole Prey Ocean Fish Recipe, Raw Coated Kibble – Protein Rich Poultry Free with Grain Dry Dog Food37.5% proteinStella & Chewy’s Wild Red Grain Free : Whole Prey Ocean Fish Recipe, Raw Coated Dry Dog Food34.1% proteinGo! Solutions Sensitivities Limited Ingredient Grain-Free Salmon Recipe Dry Dog Food26.7% proteinGo! Solutions Sensitivities Limited Ingredient Grain-Free Salmon Recipe Small Bites Dry Dog Food26.7% proteinAcana Wholesome Grains Sea to Stream Fish & Grains Recipe Dry Dog Food35.2% proteinAcana Highest Protein Wild Atlantic Recipe Dry Dog Food37.5% proteinAcana Freshwater Fish Blend Dry Dog Food33.0% proteinWellness Core Simple Limited Ingredient Grain-Free Healthy Weight Dry Dog Food28.9% proteinWellness Core Simple Limited Ingredient Grain-Free Small Breed Dry Dog Food32.2% proteinWellness Core Simple Limited Ingredient Grain-Free Salmon & Potato Recipe Dry Dog Food28.1% proteinWellness Core Six Small Breed Sustainably-Sourced Salmon Dry Dog Food38.9% proteinWellness Core Six Sustainably-Sourced Salmon Dry Dog Food36.7% proteinWellness Complete Health Grain-Free Whitefish & Menhaden Fish Meal Dry Dog Food28.9% proteinNutriSource Grain-Free High Plains Select Recipe Dry Dog Food31.1% proteinNutriSource Grain-Free Small Bites High Plains Select Recipe Dry Dog Food31.1% proteinNutriSource Element Series Outback Trails Recipe Dry Dog Food37.8% protein

Our read // On the bag

Read it as flavor, then check the fish

Natural fish flavors near the end of a list are there for taste. Look higher for named fish or fish meal if you want fish protein, and look for a stated omega-3 amount if that is your goal. For a dog with a diagnosed fish allergy, treat the flavor entry as fish exposure.

On labels as

Other names for this

Manufacturers do not all use the same wording. These all mean the same thing.

Natural Fish Flavor

Sources

What we read

Checked October 1, 2026.

  1. 1 Fish meals, fish components, and fish protein hydrolysates as potential ingredients in pet foods U.S. EPA HERO record of a Journal of Animal Science paper, 2006 // Government
  2. 2 Protein hydrolysate and oil from fish waste reveal potential as dog food ingredients Frontiers in Veterinary Science, 2024 // Journal
  3. 3 A prospective double-blinded study evaluating threshold doses of dietary allergens that trigger adverse food reactions in dogs, and time to flare after exposure Frontiers in Veterinary Science, 2026 // Journal
  4. 4 Fish solubles, condensed, defatted INRAE, CIRAD and AFZ Feed Tables, n.d. // Database
  5. 5 Natural AAFCO, n.d. // Regulator
  6. 6 What’s in the Ingredients List? AAFCO, n.d. // Regulator
  7. 7 Reading Labels AAFCO, n.d. // Regulator
  8. 8 21 CFR § 501.22 - Animal foods; labeling of spices, flavorings, colorings, and chemical preservatives. Cornell Legal Information Institute, n.d. // University
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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