Updated September 25, 2026. Fact-checked against veterinary sources; review by a licensed veterinarian is in progress. See our editorial policy.
Quick answer: Wet (canned) pet food shouldn’t sit out at room temperature for more than about 2 hours, or about 1 hour on hot days (above about 90°F / 32°C). After that, throw out what’s left. Cover opened cans and refrigerate them promptly, and use them within the time on the label, often around 3 days. Wash food bowls after each meal. Pets can get sick from bacteria in spoiled food just as people can.
Time limits at a glance
- Wet food in the bowl, room temperature: up to about 2 hours, then discard
- Hot weather or outdoors: about 1 hour, less in direct sun
- Opened can or pouch, covered in the refrigerator: usually up to 3 days (check the label, as some brands say less)
- Unopened cans: until the “best by” date, stored in a cool, dry place
- Raw or fresh-cooked refrigerated diets: follow the maker’s instructions closely, as they spoil faster
Safe storage tips
- Cover opened cans with a pet food lid or plastic wrap, or move leftovers to a sealed container.
- Refrigerate at 40°F (4°C) or below.
- Label containers with the date opened.
- Serve refrigerated food slightly warmed or at room temperature. Many cats refuse cold food. Stir well if microwaving to avoid hot spots.
- Don’t top up old food with new food. Start with a clean bowl.
Keeping bowls clean
- The FDA recommends washing pet food bowls with hot, soapy water after each use.
- Stainless steel or ceramic bowls are easier to clean than scratched plastic.
- Wash water bowls daily too.
- Wash your hands after handling pet food, especially raw diets.
Dry food storage
- Keep kibble in its original bag (which has lot information for recalls) inside a sealed container.
- Store in a cool, dry place and use within about 6 weeks of opening.
- Kibble in the bowl can stay out longer, but empty and wash the bowl daily.
Tips for grazers and busy schedules
- Timed automatic feeders with ice packs can keep wet food cool for a few hours.
- Serve smaller portions more often.
- Ask your vet about a feeding plan if your pet regularly leaves food.
Signs your pet ate spoiled food
- Vomiting or diarrhea
- Gas or stomach discomfort
- Poor appetite or lethargy
Call your vet if signs are severe, last more than a day, include blood, or affect a very young, old, or sick pet. Moldy food can contain toxins that cause tremors or seizures. That’s an emergency.
Frequently asked questions
Can I leave wet cat food out overnight?
No. Discard wet food left out for more than about 2 hours.
Why does my cat walk away from fresh wet food?
Cold temperature, strong smells from dirty bowls, or dental pain are common reasons. If appetite changes suddenly, see your vet.
Can I refreeze pet food?
Many wet foods can be portioned and frozen once, but texture may change. Thaw in the refrigerator, not on the counter.
Sources
- US FDA: Tips for safe handling of pet food and treats
- USDA Food Safety and Inspection Service: The two-hour rule and the danger zone
- Merck Veterinary Manual: Mycotoxicoses (moldy food toxins)
This article is for general education and is not a substitute for care from your own veterinarian. Learn about The Pet Vet and our editorial policy.