Last Updated on April 16, 2026 by admin
Short answer: A cat that swallows a worm is usually not facing a poison emergency, but the event can still point to parasite exposure or contaminated prey. Watch for vomiting, diarrhea, lethargy, poor appetite, or worms in the stool and call your vet if you see any of those signs.
Why cats eat worms
Cats hunt moving things. Earthworms, insects, and other small creatures can trigger that instinct, especially in outdoor cats. The behavior is normal hunting, but it is not a reason to let cats treat worms as food.
What the risk really is
The worm itself is not usually the problem. The concern is that outdoor soil, prey, and fleas can carry intestinal parasites. If your cat eats worms often, it is worth reviewing parasite prevention with your vet and reading Vet-Approved Guide: How Do Vets Deworm Cats? Find the Expert Answer and Naturally Deworming Cats: 6 Effective Methods to Try.
What to do now
Remove access to the worms if you can, offer fresh water, and monitor your cat over the next day. Do not give home remedies or human dewormers. If your cat vomits more than once, seems painful, has diarrhea, or you notice anything moving in the litter box, contact your veterinarian.
How to reduce repeat exposure
Keep your cat on routine parasite prevention, schedule fecal checks if your vet recommends them, and limit hunting when possible. A balanced diet also matters; see Cat Nutrition Basics for the basics of keeping meals species-appropriate.