Dog food types
What preservatives should I avoid in dog food?
Last updated 23 September 2026 · How we write and check this
Short answer
Most owners looking to avoid preservatives focus on synthetic options like BHA, BHT, and ethoxyquin, which have raised some long-term safety questions in older research, preferring natural alternatives such as mixed tocopherols, vitamin E, or vitamin C, which achieve a similar shelf-stabilizing effect on fats.
Why fat needs a preservative at all
Fats in dry food are prone to oxidation, becoming rancid over time, so some form of preservative is necessary to keep a bag safe and palatable throughout its shelf life, regardless of whether the source is synthetic or natural.
The specific synthetic ingredients under scrutiny
BHA, BHT, and particularly ethoxyquin have been the subject of older toxicology studies raising theoretical long-term concerns at high doses, though the levels used in commercial pet food remain within regulatory safety limits in most countries.
What natural preservation looks like on a label
Formulas using mixed tocopherols, listed as a source of vitamin E, or ascorbic acid, a form of vitamin C, achieve preservation without the synthetic compounds some owners prefer to avoid, though these natural options often provide a somewhat shorter shelf life than synthetic alternatives.
Key takeaways
- BHA, BHT, and ethoxyquin are the synthetic preservatives most commonly flagged by cautious owners.
- All dry foods need some preservative to prevent fat from turning rancid over their shelf life.
- Mixed tocopherols and vitamin C are common natural alternatives, though they may shorten shelf life somewhat.