Would you leave a loaf of bread open in your kitchen for 39 days and still eat it? Probably not! Yet that’s how long the average bag of kibble sits open before it’s gone. During that time, fats oxidize, nutrients break down, and molds or mites can quietly move in.

Most kibble is stamped with a one-year “shelf life,” but that only applies to unopened bags stored perfectly. The moment you open it, air, light, and humidity start spoiling the food. Studies in Frontiers in Veterinary Science (2020) show that oxidation in pet food increases quickly once exposed to air, even in “sealed” containers. As antioxidants like vitamin E get used up, fats go rancid — producing compounds that can damage your dog’s cells and organs over time.

Warm, humid conditions exacerbate the situation by promoting mold growth, including Aspergillus flavus, which produces aflatoxin B1—a potent natural toxin associated with liver damage and immune suppression (American Journal of Veterinary Research, 2021).

Simple Steps for Fresher Food

1. Keep kibble in its original bag, even inside a bin.
2. Buy smaller bags and use them within 7–14 days.
3. Store in a cool, dry place and toss food that smells “off.”
4. Avoid free-feeding — don’t leave food sitting out all day.

A Healthier Alternative

If you’d like to go a step further (and who’s furry family member is not worth that?!), consider air-dried, freeze-dried, or fresh-frozen dog foods. These retain more natural nutrients and healthy fats because they’re minimally processed and not exposed to months of heat and air. Research in Animals (2022) suggests that less processed, high-quality diets support better digestion, coat health, and energy levels in dogs.  They’re really no different than people in that!

Small changes in freshness can make a big difference in your dog’s long-term health — starting with what’s in the bowl and how you store it.

Link to Morter March Monday Rebroadcast: