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Ingredient file // Preservative

Sodium Propionate

A mold inhibitor, not dog nutrition

Sodium propionate is a manufactured salt added to inhibit mold. Studies found less mold in treated feed ingredients and laboratory biscuits, but did not test finished kibble. For your dog, it serves no meaningful nutritional purpose.

Role in the food Does a job
What it is
A manufactured salt of propionic acid used to slow mold growth in food and feed.
Made from
Propionic acid and sodium hydroxide
Main job
Inhibit mold growth
Typical amount
Not found in sources reviewed
Watch for
Dogs on sodium restricted diets
Not the same as
Propionic acid

Straight answer

Is Sodium Propionate safe for dogs?

Read it as a preservative, then move on

Sodium propionate on a bag tells you the maker added a mold inhibitor. It does not prove how long that kibble stays fresh. Judge the recipe by the ingredients above it and store the bag properly. If your dog needs sodium restriction, request the finished food's total sodium figure.

Why it is in the food
Inhibit mold growth

Our read // In our catalog

In 1 of every 139 foods we track

Share of foods that list it

<1%

23 of the 3,205 foods with an ingredient list on file, from 1 brand. All dry dog food.

Each square is 1% of the catalog

Where it sits on the label

Median position 12. In the top five of 0 foods, so it is usually a minor ingredient.

Top five List position, heaviest first

Above the salt

0%

Usually listed after the salt, which caps it at roughly 1% of the recipe in 100% of foods.

Price per lb

Foods with it $2.17
All foods $3.25

Median of the cheapest bag price across 22 priced foods, 33% below 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 Bil-Jac. 1 brand use it in total.

What it is

How it is made

Chemical producers make sodium propionate as a preservative. They react propionic acid with sodium hydroxide, then dry and screen the resulting salt so food manufacturers can measure it into recipes.6,8

  1. 01 // Source Acid and alkali Propionic acid, sodium hydroxide and water enter the manufacturer's production line.
  2. 02 // Process Neutralized The acid and alkali react in water, leaving sodium propionate in solution.
  3. 03 // Process Dried and screened A dryer removes water, and a screener prepares the solid material for packaging.
  4. 04 // Output Dry additive The finished sodium propionate ships as crystals or powder for measured addition to food and feed.

What is in it

Composition, dry matter

98.5

% minimum

This is the feed additive's required sodium propionate purity on a dry basis. It describes the additive before mixing, not the amount in dog food.

Sodium propionate, feed specification 98.5%4
Sodium propionate, NF specification 99-100.5%7
Sodium 23.9%6

The purity rows are specifications for different grades, not separate ingredients to add together. Sodium is part of the same molecule. None of these figures reveals the additive's concentration in a finished recipe.4,6,7

Why it is in the bag

There to slow mold, not to feed

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

Makers add sodium propionate to slow mold growth, not to feed the dog. In a feed ingredient trial, treated grains and meals had lower yeast and mold counts during storage. Labels list ingredients by weight, but its place on the list does not reveal the dose, and no source we opened gives a typical amount in dog food. EFSA judged it safe for animals under its authorized conditions.2,4,9

  1. 01

    Controls mold in inputs

    A feed ingredient trial found lower yeast and mold counts in treated grains, meals and poultry byproducts during storage. That supports using it before ingredients reach the mixer.2

  2. 02

    Protects purchased stock

    Lower mold counts are a practical reason to treat stored ingredients. The feed study measured microbes, not discarded stock or money saved, so a manufacturer's savings cannot be calculated from it.2

How much A feed ingredient study tested 0.30% sodium propionate; no opened source gives a typical amount in finished dog food.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

    Slows mold in stored feed ingredients

    Evidence

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

    A controlled trial treated 6 feed ingredients with 0.30% sodium propionate and followed them for 8 weeks. Yeast and mold counts fell, supporting ingredient storage use. It did not test finished kibble.2

  2. Brands say

    Keeps an opened bag fresh for months

    Outruns the evidence

    Evidence

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

    At 0.10%, sodium propionate prevented measured mold growth in laboratory biscuits for 3 months. Biscuits are not dog food, and that result cannot tell an owner how long an opened kibble bag will stay fresh.3

  3. Brands say

    Improves your dog's digestion

    Outruns the evidence

    Evidence

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

    A dog trial found no change in digestibility or stool consistency with 1.3 g/kg propionic acid. It tested the acid rather than sodium propionate, and provides no evidence that this preservative improves digestion.1

  4. Owners say

    Sodium propionate is toxic to dogs

    Outruns the evidence

    Evidence

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

    In a 90-day dog study, 1% propionic acid caused esophageal changes; 0.3% did not. The acid is a different ingredient. EFSA judged sodium propionate safe under its authorized feed conditions, so toxicity cannot be inferred from the label name.4,5

Straight answers

What owners ask

  1. Q01

    Is it just filler?

    No

    It has a defined preservative job. Studies measured lower mold counts in treated feed ingredients, though they did not measure a nutritional benefit or prove a shelf life for finished kibble.2

  2. Q02

    Is it table salt?

    No

    Table salt pairs sodium with chloride; this ingredient pairs sodium with propionate. Sodium makes up 23.93% of the dry compound, but the label does not disclose how much compound the food contains.6

  3. Q03

    Does it replace careful storage?

    No

    Mold inhibition has limits, and the available trials do not cover an opened bag of kibble. Keep dry food cool and dry, preferably in its original bag so the lot information remains available.2,3,10

  4. Q04

    Does its position reveal the dose?

    No

    Ingredients are listed from most to least by weight. A late listing signals less weight than the ingredients above it, but does not disclose the sodium propionate concentration or the food's total sodium.9

Who uses it

Brands, best sellers and the company it keeps

Top brands, by foods that list it

  1. Bil-Jac 23 / 32

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

Usually listed with, share of the foods that list it

  1. Chicken 100%
  2. Dried Beet Pulp 100%
  3. Brewers Dried Yeast 100%
  4. Chicken By-Product 96%
  5. Corn Meal 96%
  6. Oatmeal 96%
  7. Chicken By-Product Meal 74%
  8. Choline Chloride 74%
  9. Flaxseed 52%
  10. Menhaden Fish Meal 48%
  11. Salt 39%
  12. Monocalcium Phosphate 26%

On the shelf

Foods that list Sodium Propionate

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

Bil-Jac Grain-Free Adult Dry Dog FoodBil-JacBil-Jac Grain-Free Adult Dry Dog FoodDry // No. 8 on the labelBil-Jac Sensitive Solutions Healthy Weight Support Dry Dog FoodBil-JacBil-Jac Sensitive Solutions Healthy Weight Support Dry Dog FoodDry // No. 11 on the label
Show 21 more
Bil-Jac Senior Dry Dog FoodBil-JacBil-Jac Senior Dry Dog FoodDry // No. 11 on the labelBil-Jac Large Breed Dry Dog FoodBil-JacBil-Jac Large Breed Dry Dog FoodDry // No. 11 on the labelBil-Jac Small Breed Dry Dog FoodBil-JacBil-Jac Small Breed Dry Dog FoodDry // No. 11 on the labelBil-Jac Large Breed Adult Dry Dog FoodBil-JacBil-Jac Large Breed Adult Dry Dog FoodDry // No. 11 on the labelBil-Jac Senior Select Formula Dry Dog FoodBil-JacBil-Jac Senior Select Formula Dry Dog FoodDry // No. 11 on the labelBil-Jac Reduced Fat Formula Dry Dog FoodBil-JacBil-Jac Reduced Fat Formula Dry Dog FoodDry // No. 11 on the labelBil-Jac Small Breed Adult Dry Dog FoodBil-JacBil-Jac Small Breed Adult Dry Dog FoodDry // No. 11 on the labelBil-Jac Picky No More Medium & Large Breed Dry Dog FoodBil-JacBil-Jac Picky No More Medium & Large Breed Dry Dog FoodDry // No. 12 on the labelBil-Jac Adult Dry Dog FoodBil-JacBil-Jac Adult Dry Dog FoodDry // No. 12 on the labelBil-Jac Puppy Dry Dog FoodBil-JacBil-Jac Puppy Dry Dog FoodDry // No. 12 on the labelBil-Jac Small Breed Puppy Dry Dog FoodBil-JacBil-Jac Small Breed Puppy Dry Dog FoodDry // No. 12 on the labelBil-Jac Large Breed Puppy Dry Dog FoodBil-JacBil-Jac Large Breed Puppy Dry Dog FoodDry // No. 12 on the labelBil-Jac Adult Select Formula Dry Dog FoodBil-JacBil-Jac Adult Select Formula Dry Dog FoodDry // No. 12 on the labelBil-Jac Picky No More Medium Breed Dry Dog FoodBil-JacBil-Jac Picky No More Medium Breed Dry Dog FoodDry // No. 12 on the labelBil-Jac Picky No More Small Breed Dry Dog FoodBil-JacBil-Jac Picky No More Small Breed Dry Dog FoodDry // No. 12 on the labelBil-Jac Puppy Select Formula Dry Dog FoodBil-JacBil-Jac Puppy Select Formula Dry Dog FoodDry // No. 12 on the labelBil-Jac Sensitive Solutions Skin & Stomach Support Dry Dog FoodBil-JacBil-Jac Sensitive Solutions Skin & Stomach Support Dry Dog FoodDry // No. 13 on the labelBil-Jac 30/20 Performance - Bil-Jac Dry Dog FoodBil-JacBil-Jac 30/20 Performance - Bil-Jac Dry Dog FoodDry // No. 13 on the labelBil-Jac Small Breed Senior Dry Dog FoodBil-JacBil-Jac Small Breed Senior Dry Dog FoodDry // No. 13 on the labelBil-Jac Sensitive Solutions Dry Dog FoodBil-JacBil-Jac Sensitive Solutions Dry Dog FoodDry // No. 13 on the labelBil-Jac Picky No More Large Breed Dry Dog FoodBil-JacBil-Jac Picky No More Large Breed Dry Dog FoodDry // No. 14 on the label

Sources

What we read

Checked October 22, 2026.

  1. 1 Digestibility and palatability of dog foods containing different moisture levels, and the inclusion of a mould inhibitor Animal Feed Science and Technology, abstract via FAO AGRIS, 2010 // Database
  2. 2 Effects of Storage Type and Inclusion of Sodium Propionate on Microbial Profile of Feed Ingredients Commonly Used in Pig Diets Journal of Animal Research, 2015 // Journal
  3. 3 The Effect of Sodium Propionate on Microorganism and Self life of Laboratory Biscuit Baghdad Science Journal, 2009 // Journal
  4. 4 Assessment of the feed additive consisting of sodium propionate for all terrestrial animal species for the renewal of its authorisation (BASF SE) EFSA Journal, 2024 // Journal
  5. 5 Scientific Opinion on the re-evaluation of propionic acid (E 280), sodium propionate (E 281), calcium propionate (E 282) and potassium propionate (E 283) as food additives EFSA Journal, 2014 // Journal
  6. 6 Sodium Propionate Crops: Technical Advisory Panel Review USDA National Organic Program, 2002 // Government
  7. 7 Sodium Propionate United States Pharmacopeia, 2022 // Regulator
  8. 8 Manufacturing Process Flowchart - Sodium Propionate, NF - S1418 Spectrum Chemical Mfg Corp, n.d. // Industry
  9. 9 Pet Food U.S. Food and Drug Administration, n.d. // Government
  10. 10 Proper Storage of Pet Food & Treats U.S. Food and Drug Administration, n.d. // Government
  11. 11 Heart Disease - Nutrition Cummings School of Veterinary Medicine, Tufts University, 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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