What Does No Artificial Preservatives Actually Mean in Dog Food?

At a glance

• Artificial preservatives are synthetic chemicals added to dog food to stop fats going rancid and prevent bacterial growth.
• Common artificial preservatives in dog food include BHA, BHT, ethoxyquin, and sodium nitrite.
• Natural alternatives include vitamin E (tocopherols), vitamin C (ascorbic acid), and rosemary extract.
• Some dog foods use processing methods — like heat-sealing or air-drying — that remove the need for any preservatives at all.
• "No artificial preservatives" on a label is meaningful, but only tells part of the story — the rest of the ingredients list matters too.

What are artificial preservatives, exactly?

Artificial preservatives are synthetic chemicals added to dog food to stop it spoiling. Fats in particular go rancid quickly when exposed to oxygen — a process called oxidation — and bacteria can multiply in moist food within hours. Preservatives slow or prevent both.

The most common ones you'll see listed on ingredients labels are:

• BHA (butylated hydroxyanisole) and BHT (butylated hydroxytoluene) — synthetic antioxidants used to stop fats oxidising
• Ethoxyquin — originally developed as a pesticide, still used in some pet foods and fish meal
• Sodium nitrite — used in some meat-based foods to inhibit bacterial growth and maintain colour
• Propyl gallate — another synthetic antioxidant, less common but still present in some formulas

These are all approved for use in pet food at regulated levels. But growing evidence links long-term exposure to some of them — particularly BHA and ethoxyquin — to oxidative stress and potential carcinogenic effects. The research is ongoing, and the science isn't settled. That said, many owners prefer to avoid them on precautionary grounds, and that preference is reasonable.

What do brands use instead?

There are two routes a brand can take when removing artificial preservatives: replace them with natural alternatives, or change the production method so preservatives aren't needed at all.

Natural preservatives work on the same principle — they prevent oxidation and bacterial growth — but use compounds that occur in nature rather than being synthetically produced. The most common ones are:

• Mixed tocopherols (vitamin E) — the most widely used natural antioxidant in pet food
• Ascorbic acid (vitamin C) — less stable than tocopherols but effective in some formulas
• Rosemary extract — a natural antioxidant, though some dogs with epilepsy are sensitive to it in larger amounts

The honest caveat here is that natural preservatives are generally less effective than synthetic ones. Foods preserved with tocopherols have a shorter shelf life than foods preserved with BHA or BHT. That's not a reason to avoid them — it just means checking the best-before date matters more.

The second route is to use a production method that removes the need for preservatives entirely. Freeze-drying, air-drying, and in-pack cooking all create conditions where bacteria cannot grow and oxidation is controlled through packaging rather than additives. Fresh dog food prepared and sealed this way can sit on a shelf without a single preservative added.

Marleybones Pantry Fresh meals use in-pack slow cooking — ingredients are sealed raw into the pouch, then cooked inside it. The sealed environment means there's no oxygen for bacteria to work with and no need for any preservative, natural or artificial.

Is "no artificial preservatives" actually a meaningful claim?

Yes — but it's not the whole story.

A food can carry a "no artificial preservatives" label and still contain plenty of other additives: artificial colours, synthetic flavour enhancers, or fillers that dilute the nutritional value of the meal. The preservative claim tells you something about one category of additive. It says nothing about the quality of the protein, the processing method used, or what else has been added.

The most useful thing you can do is read the full ingredients list rather than relying on front-of-pack claims. Understanding how to read a dog food label makes the claim easier to evaluate in context. Ingredients are listed in descending order by weight, so the first few tell you the most about what the food actually is.

A food with no artificial preservatives but "meat and animal derivatives" as its first ingredient is a different proposition to one with named meat at the top, real vegetables, and a short, recognisable ingredients list. The preservative claim is one data point — use it as a prompt to look further, not as a reason to stop there.

It's also worth noting that "no preservatives" and "no artificial preservatives" are different statements. The first means nothing has been added to preserve the food. The second means only that synthetic preservatives haven't been used — natural ones still may have been. Both claims are legitimate, but they don't mean the same thing.

If your dog has a sensitive stomach or a history of reacting to certain foods, the signs of a food intolerance are worth knowing — reactions to additives can look similar to protein intolerances, and the two are often confused. If symptoms are persistent or worsening, speak to your vet before changing your dog's food.

Marleybones meals contain no preservatives of any kind. The Pantry Fresh format — shelf-stable through in-pack cooking rather than additives — means the label claim is backed by the production method, not just a reformulation of what's been added.

For dogs whose owners want to explore preservative-free fresh feeding, the range is available in four recipes — beef, chicken, lamb, and salmon — all complete for every life stage.

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FAQs

Are artificial preservatives dangerous for dogs?

At the regulated levels used in commercial pet food, artificial preservatives are not considered acutely toxic. However, some research suggests long-term exposure to certain preservatives — particularly BHA and ethoxyquin — carries potential risks. Many owners choose to avoid them as a precaution, which is a reasonable position given the alternatives now available.

What's the difference between BHA and BHT?

Both are synthetic antioxidants used to prevent fats from going rancid in dog food. BHA (butylated hydroxyanisole) and BHT (butylated hydroxytoluene) are chemically similar and are often used together. Both have been flagged in some studies for potential carcinogenic effects at high doses, though they remain approved for use in pet food at current levels.

Can a dog food really be shelf-stable without any preservatives?

Yes. The key is the production method. Foods that are cooked and sealed in airtight packaging — like Marleybones Pantry Fresh meals — eliminate the oxygen and moisture that bacteria and oxidation need to develop. This makes them shelf-stable for months without any preservatives being added.

How do I know if my dog's food contains artificial preservatives?

Check the ingredients list on the packaging. BHA, BHT, ethoxyquin, sodium nitrite, and propyl gallate will be listed by name if present. If the list is very long or contains terms you don't recognise, it's worth looking them up. Front-of-pack claims like "no artificial preservatives" should always be verified against the actual ingredients list.

Are natural preservatives always better than artificial ones?

Natural preservatives are generally considered lower-risk, but they are less effective at extending shelf life than synthetic alternatives. Foods using natural preservatives have shorter shelf lives, so checking best-before dates is important. For foods where the production method removes the need for preservatives entirely, the question doesn't arise.

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