Ethoxyquin
Ethoxyquin is a synthetic antioxidant used to protect some animal-feed ingredients against oxidation. Feed Wise prefers alternatives because of unresolved safety questions in European assessments. Its presence and permitted use must be checked from current, market-specific information; it should not be assumed to be hidden in every fish-containing food.
Is Ethoxyquin good or bad in dog food?
Feed Wise classifies Ethoxyquin as avoid in this ingredient reference. That label is a starting point, not a verdict on every food that contains it: the ingredient’s form, amount, position on the label and the rest of the recipe still matter.
What it actually is
Ethoxyquin is a chemically defined preservative, not a nutrient that a dog needs in its own right. Its technological purpose is to slow oxidative deterioration. It has been used with oxidation-prone materials such as fish meal, including during transport and storage before the final food is made.
The original ingredient, its transformation products and manufacturing impurities are distinct parts of a safety assessment. This matters because a concern may relate to more than the named antioxidant alone. EFSA's assessment discussed the impurity p-phenetidine and the available information for long-living and reproductive animals.
Fish meal is not synonymous with ethoxyquin. A meal can be preserved by different systems, and a fish-based food may use fresh fish, a named meal, oil or several forms. Neither a fish picture nor the presence of a meal on the panel proves which antioxidant the supplier used. The manufacturer needs to confirm its sourcing and formulation.
Why it's used in dog food
Oxidation control is important for fat-rich ingredients. Ethoxyquin has also been used to reduce the risk of fish meal heating during sea transport. That is an industrial function, not a reason for owners to use the concentrated chemical themselves.
Regulatory decisions differ by jurisdiction and by the conditions assessed. FDA's published US guidance describes approved uses and labelling requirements. It explicitly says that declaration is required whether ethoxyquin is added directly to animal food or arrives indirectly as part of an ingredient. The claim that supplier-added ethoxyquin never needs to be labelled is therefore not a sound general statement.
In 2022, EFSA could not conclude on safety for long-living and reproductive animals because of an impurity-related concern, and the EU denied the relevant feed-additive authorisation. These findings provide a concrete reason to ask questions and prefer alternatives. They should be described accurately rather than converted into a claim that any exposure has been proved to cause a particular illness in dogs.
For an illustrative calculation, 50 mg per kg in a hypothetical food would equal 10 mg in a 200 g portion. This is only arithmetic showing the information needed to estimate exposure; it is not an approved inclusion, a safe serving or a recommendation. A label without a concentration cannot support that calculation, and any meaningful assessment would also consider the dog's size, duration and other exposures.
Pros
- •Has a documented antioxidant function in susceptible feed materials. A comparison with an alternative should include how the replacement protects the ingredient through transport, storage and the finished product's shelf life.
- •Its chemical identity permits specific questions and evidence checks. A written statement about the exact recipe and its ingredient suppliers is more useful than an assumption about all fish meals.
- •Current regulatory sources clarify important distinctions, including direct and indirect addition. Owners can ask for a precise answer without relying on repeated claims that the ingredient is always concealed.
Cons
- •The European assessment left material safety questions unresolved for long-living animals. That uncertainty is relevant when selecting a food intended for repeated long-term feeding.
- •Consumer labels may not provide concentrations, impurity specifications or the complete supplier history. Absence of detailed information limits exposure assessment even when the ingredient declaration is clear.
- •A broad ethoxyquin-free marketing claim needs a defined scope. No addition at the final factory is not the same statement as a documented policy covering all purchased meals and fats.
Safety notes
Do not add ethoxyquin or any concentrated feed preservative to a homemade diet. Industrial ingredients require controlled handling and formulation. Food preservation also cannot reverse spoilage after it has occurred.
If you suspect a food-related problem, retain the batch details and contact your veterinary team with the actual diet and symptoms. A preservative name on its own cannot diagnose the cause. Avoid abruptly replacing a medically necessary diet with an incomplete alternative because of an online claim; identify a nutritionally appropriate option.
This page describes specific public assessments, not a complete statement of Canadian import or feed law. A US permitted use or an EU decision should not be copied into a claim about every Canadian product. The maker or relevant authority should confirm the requirements that apply to the exact product and market.
Sourcing & quality
Ask the manufacturer whether ethoxyquin is used in the finished food, any premixes, and supplied fish meals or fats. Request the answer for the exact recipe sold in Canada and ask when that information was last checked. If the company uses an avoidance claim, ask how it verifies suppliers and handles formulation changes.
Do not infer a brand's policy from another brand, a former owner or an old website statement. Likewise, do not assume that an antioxidant-free claim describes a stable product. Ask what preservation approach replaces it, how shelf life is established and what storage instructions apply after opening.
When evaluating the reply, distinguish no intentionally added ingredient from a tested absence below a stated detection limit. These are different kinds of evidence. You do not need to conduct a laboratory assessment yourself, but the company should be able to explain what its claim actually means.
Commonly found in
Skip this if…
Choose a suitable alternative if avoiding ethoxyquin is part of your preferences or the manufacturer cannot answer a material sourcing question. For a dog needing a specialised diet, compare equivalent options with the veterinary team.
The verdict
Feed Wise's avoid tier reflects a preference for other preservation systems and the unresolved issues in the cited European assessment. Verify the actual product rather than assuming every fish meal contains it. Current labelling guidance is more reliable than the claim that indirect addition can always be hidden.