Ingredient file // Flavor
Mackerel Broth
Fish flavor and moisture, mostly water
Mackerel broth is the liquid produced when mackerel or its parts are cooked. It adds moisture and fish flavor to wet food, along with some dissolved protein. Its weight on an ingredient list does not tell you how much mackerel flesh the food contains.
- What it is
- Liquid from cooking mackerel or its parts, with dissolved material released from the fish.
- Made from
- Mackerel or mackerel parts
- Main job
- Moisture and fish flavor
- Typical amount
- Not published
- Watch for
- Fish allergy and poorly handled fish
- Not the same as
- Mackerel flesh
Straight answer
Is Mackerel Broth safe for dogs?
Read broth as liquid, then check the fish
Ingredient order reflects weight, and broth carries plenty of water. Look for mackerel or another named protein elsewhere on the list, then check the finished food's protein guarantee and nutritional adequacy statement. Do not buy it for an unmeasured omega-3 or coat claim.
- Why it is in the food
- Moisture and fish flavor
- How common
- Listed by 4 of the 3,204 foods we track
Our read // In our catalog
In 1 of every 801 foods we track
Share of foods that list it
<1%
4 of the 3,204 foods with an ingredient list on file, from 1 brand. 3 dog food topper, 1 wet dog food.
Each square is 1% of the catalog
Where it sits on the label
Median position 4. In the top five of 4 foods, so it is usually a main ingredient.
Above the salt
Almost always listed before the salt, so there is more of it than a pinch.
Who leans on it
100%
of the foods that list it are from Nulo. 1 brand use it in total.
What it is
How it is made
Mackerel broth is the liquid produced when mackerel is cooked, carrying material released from the fish into the surrounding water. A dog food recipe lists it as its own ingredient, separate from mackerel flesh.2,5
- 01 // Source Mackerel and parts Whole fish or usable mackerel parts supply the material that is cooked to make the broth.
- 02 // Process Cooked Heating the fish releases water and some soluble protein and fat into the surrounding liquid.
- 03 // Process Liquid collected The liquid is separated from the cooked fish solids; a studied fish broth also had its fat removed.
- 04 // Output Mackerel broth The collected liquid goes into a wet recipe as a line separate from mackerel flesh.
What is in it
Composition, dry matter
71
% protein
Protein in the dry solids of one studied fish broth. Its water content means the wet liquid supplies far less protein by weight.
Why it is in the bag
What the manufacturer gets
-
01
Adds cooking liquid
Broth supplies liquid for a wet recipe and carries material released by cooked fish. A dog food label lists it separately from the fish itself.2,5
-
02
Adds fish flavor
A manufacturer promotes broth for taste. Dog tests of other fish ingredients do not isolate mackerel broth, so its effect on appetite remains unmeasured.1,5
How much A published dog stew lists mackerel broth without giving its percentage, so that label cannot supply a usual inclusion amount.5
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
Broth adds water to a dog's meal
Evidence
- Strong
- Some
- Thin
- None
One measured fish broth was 10.49% dry matter, so nearly 90% of its weight was water. Adding broth increases a meal's moisture. That arithmetic does not demonstrate a health benefit for a dog already drinking enough.2
-
Brands say
Fish broth makes picky dogs eat
Outruns the evidence
Evidence
- Strong
- Some
- Thin
- None
In a 12-dog test, diets containing different fish hydrolysates and oils drew nearly equal intake, 49.9 versus 50.1. Those were concentrated fish ingredients in kibble, not mackerel broth, so mackerel broth's effect on intake is not measured by the cited trial.1,5
-
Brands say
Omega-3s in broth improve skin and coat
Outruns the evidence
Evidence
- Strong
- Some
- Thin
- None
A degreased fish broth contained 0.4% fat as fed. In a dog trial, fish hydrolysate plus added fish oil raised blood omega-3 levels without improving coat scores. Neither result shows a coat benefit from broth.1,2
-
Brands say
Mackerel broth supplies substantial fish protein
Outruns the evidence
Evidence
- Strong
- Some
- Thin
- None
The measured fish broth contained 7.46% protein as fed despite protein dominating its dry solids. AAFCO's dry matter protein standard does not reveal how much broth a recipe uses. Its contribution cannot be inferred from the ingredient name.2,3,4
Straight answers
What owners ask
-
Q01
Is it just filler?
NoIt supplies liquid and fish flavor, useful jobs in wet food. Its water also counts toward ingredient weight, so a prominent label position does not mean it contributes as much protein as mackerel flesh.2,4,5
-
Q02
Does it count as mackerel meat?
NoBroth is cooking liquid with dissolved fish material. Mackerel listed separately is the fish itself. Read both lines, then check the finished food's protein guarantee and nutritional adequacy statement.3,4,5
-
Q03
Can a fish-allergic dog eat it?
Avoid itFish broth contains fish protein. A review identified fish as a trigger in 5 dogs with proven food reactions. Keep mackerel broth out of a fish-free elimination diet.2,6
Who uses it
Brands, best sellers and the company it keeps
Top brands, by foods that list it
Foods that list it / all the brand's recipes we track.
Usually listed with, share of the foods that list it
- Mackerel 100%
- Lamb 50%
- Lamb Broth 50%
- Kelp 50%
- Chicken 50%
- Chicken Broth 50%
- Mussel 25%
- Pumpkin 25%
- Sweet Potatoes 25%
- Coconut Oil 25%
- Green Beans 25%
- Carrots 25%
On the shelf
Foods that list Mackerel Broth
4 foods in our catalog list it, highest on the label first.
NuloNulo FreeStyle Meaty Pouches Mackerel, Chicken & Mussel Recipe Grain-Free Dog Food Topper
NuloNulo MedalSeries Meaty Pouches Lamb, Mackerel & Kelp Recipe Grain-Free Dog Food Topper
NuloNulo FreeStyle Meaty Pouches Lamb, Mackerel & Kelp Recipe Grain-Free Dog Food Topper
NuloNulo Savory Stews Ancient Grains Chicken & Mackerel Recipe Wet Dog Food Sources
What we read
Checked October 1, 2026.
- 1 Protein hydrolysate and oil from fish waste reveal potential as dog food ingredients
- 2 The effect of diets supplemented with fish broth and fish oil on the health of weaners
- 3 Official Feed Terms, Common or Usual Ingredient Names and Ingredient Definitions
- 4 Reading Labels
- 5 Savory Stews Ancient Grains Chicken & Mackerel Recipe for Dogs
- 6 Critically appraised topic on adverse food reactions of companion animals (2): common food allergen sources in dogs and cats
- 7 Scombrotoxin Poisoning and Decomposition