Dog food can go bad before its "best by" date if stored poorly, and stays good well past the date if stored well. Here's what actually determines freshness and how to store each type correctly.

Dry Kibble

Unopened bag: 12-18 months from manufacture date. The "best by" on the bag is your guide.

Opened bag: 4-6 weeks for best quality. Some sources say up to 3 months, but quality (and palatability) declines noticeably after a month or so.

Storage tips:

  • Keep food in its original bag — packaging is designed to preserve freshness
  • Place the entire bag inside an airtight container (rather than dumping kibble loose into one)
  • Store in a cool, dry place (under 80°F)
  • Avoid garage storage (temperature swings, pest access)
  • Don't store near appliances that emit heat

Why keep food in the original bag: it has a fat-resistant lining that prevents oils from going rancid. Dumping kibble directly into a plastic bin lets the fats interact with the plastic and air, accelerating spoilage.

Wet/Canned Food

Unopened can/pouch: 2-5 years (check date). Cans last longer than pouches due to better moisture/oxygen barrier.

Opened can/pouch: 5-7 days refrigerated. Transfer to airtight container with lid (don't store opened can directly — metal can affect taste and start rusting).

In bowl at room temperature: 2-4 hours max. Discard uneaten portions.

Fresh/Refrigerated Food

Sealed refrigerated: Per package date (typically 5-14 days).

Once opened: 3-5 days refrigerated.

Frozen: 4-6 months in freezer.

After thawing: 3-5 days refrigerated. Don't refreeze.

Treats

Dry biscuits: Similar to kibble — 4-6 weeks after opening.

Soft/chewy treats: 2-4 weeks after opening. Keep tightly sealed.

Dental chews: Per package date if unopened. Once opened, 4-8 weeks.

Freeze-dried: 6-12 months unopened, 6-8 weeks opened.

Signs Food Has Gone Bad

  • Rancid smell: Sharp, "off," or chemical-like odor (different from normal food smell)
  • Visible mold: Even small spots mean toss the bag
  • Bugs: Pantry moths, weevils — toss
  • Strange color: Color changes from normal
  • Dog's refusal: Sudden refusal of previously-loved food can indicate spoilage
  • GI upset after eating: Especially if multiple dogs in household have the same reaction

What Causes Spoilage

  • Heat: Speeds up fat rancidity
  • Light: Same effect
  • Air: Oxidation of fats
  • Humidity: Mold growth
  • Pests: Contamination from rodents, insects

Buying Smart

  • Buy quantities your pet will use within 4-6 weeks of opening
  • Larger bags are economical but only if you'll use them before quality declines
  • For multi-pet households, larger bags work; single-pet households often do better with smaller bags
  • Check manufacturing date if possible — fresher is better

FAQ

Can I feed dog food past the "best by" date?

"Best by" is quality, not safety. Food past this date may have reduced nutritional value and palatability but isn't typically dangerous. If it smells normal and your dog eats it, it's probably OK. After 3-6 months past date, replace.

Should I freeze kibble for long-term storage?

You can. Vacuum-seal portions for best results. Thaw at room temperature before serving.

How long can wet food sit in the bowl?

2-4 hours. Discard anything uneaten after that. Refrigerate unopened or covered portions.

The Bottom Line

Keep dry food in its original bag inside an airtight container, in a cool dry place. Refrigerate opened wet food. Watch for rancid smell, mold, or your dog refusing food — those signal spoilage regardless of date.