Small white worms in dry cat food are usually the larvae of pantry pests such as Indian meal moths or flour beetles. They are not parasites from your cat. Throw out the infested food and clean the storage area.
Where the worms come from
Pantry pests are common in warehouses, trucks, and stores. Eggs can already be in the bag when you buy it, then hatch at home in warm, humid conditions. The larvae feed on dry food and leave silky webbing, clumps, and dark specks.
- Indian meal moth larvae: Creamy white worms, often with a brown head, that spin webbing on the kibble and bag seams.
- Flour and grain beetle larvae: Small, slender worms that infest dry food, flour, and cereals.
Is the food safe for my cat?
A few insects are not usually poisonous, but infested food is not worth the risk. Larvae and their waste can carry mold and bacteria, and the food may be stale. Cats can get an upset stomach, vomiting, or diarrhea from spoiled food. Throw out the whole bag if you see live worms, webbing, or clumps. Do not try to pick out the bugs.
Worms in the food are not the same as worms in your cat
Tapeworm segments look like small white or cream-colored grains of rice, often near your cat’s rear end or in the litter box. Roundworms look like spaghetti. These are parasites that your cat picks up from fleas, hunting, or other animals, not from the food. If you see worms in the stool or your cat vomits worms, call your veterinarian for the right test and treatment. Do not give dewormers without your vet’s advice.
What to do right now
- Seal the infested food in a bag and take it to the outside trash.
- Check nearby food: other pet food, birdseed, flour, cereal, and rice.
- Vacuum shelves and corners, then wipe them with hot, soapy water.
- Wash the storage bin before refilling it.
- Keep the bag and receipt. Contact the retailer or manufacturer for a refund, and report the lot number.
How to prevent it
- Buy bags you can finish in about four to six weeks.
- Store food in a clean, airtight container made of hard plastic, metal, or glass.
- Keep it in a cool, dry place rather than a hot garage.
- Do not top off an old bag with new food.
- Check the bag for holes or webbing before you buy it.
The same steps apply to dog food, as we explain in bugs in dog food. For help choosing a safer food, see the best cat pouch food for wet cats.
Bottom Line
White worms in cat food are almost always pantry pests. Toss the food, clean the area, and store new food in a sealed container. Call your vet if your cat has vomiting, diarrhea, or you see worms in the stool.
This article is general information, not veterinary advice.
