Cat worms in poop typically look like either small white spaghetti strands (roundworms) or tiny rice-grain-sized segments (tapeworms). These are the two types you’re most likely to spot with your own eyes. Other common parasites, like hookworms, are too small to see without a microscope, so a clean-looking stool doesn’t necessarily mean your cat is parasite-free.
Roundworms: White Spaghetti-Like Strands
Roundworms are the most common intestinal parasite in cats, especially kittens. When passed in stool or vomit, they look like white or cream-colored noodles, typically 3 to 6 inches long. They’re smooth, round in cross-section, and sometimes coiled into loose spirals. You might see one or several tangled together on the surface of or mixed into the stool. Freshly passed roundworms can still be moving, which is unsettling but actually makes identification easier.
Roundworm eggs, by contrast, are completely invisible to the naked eye. They measure roughly 65 to 75 micrometers, smaller than the width of a human hair. A cat can be shedding thousands of eggs in its stool with no visible worms present at all. That’s why a single clean-looking bowel movement doesn’t rule out an infection.
Tapeworms: Rice-Grain Segments
Tapeworms look completely different from roundworms. You won’t see a long intact worm. Instead, the tapeworm sheds small flat segments called proglottids, each about the size of a grain of rice (roughly 2 millimeters). When fresh, these segments are white, flat, and can visibly stretch and contract as they move. You’ll typically find them on the surface of a fresh bowel movement or stuck to the fur around your cat’s rear end.
Once dried out, the segments turn yellowish, harden, and look more like sesame seeds. You might notice them on your cat’s bedding, on furniture, or anywhere your cat has been sitting. Cats with tapeworms often scoot their rear along the floor or lick the area excessively because the crawling segments cause irritation.
Cats pick up the most common tapeworm species by swallowing infected fleas during grooming. So if you’re seeing tapeworm segments, your cat likely has or recently had a flea problem too.
Worms You Won’t See
Hookworms and some other intestinal parasites are too small to spot in your cat’s stool without magnification. A cat with hookworms may have dark, tarry stool (from blood loss in the intestines), diarrhea, weight loss, or a dull coat, but you won’t find visible worms to confirm it yourself. The same goes for single-celled parasites like Giardia and Coccidia, which cause diarrhea but leave no visible trace.
This is why veterinarians use a test called fecal flotation rather than relying on visual inspection. A small stool sample is mixed with a special solution that causes parasite eggs, which are denser than normal fecal material, to float to the surface where they can be examined under a microscope. It’s a routine, inexpensive test that catches infections you’d never notice at home.
Signs That Point to Worms
Sometimes the worms themselves aren’t what tips you off. Cats with intestinal parasites often show a combination of symptoms that together paint a clear picture: a bloated or pot-bellied appearance (especially in kittens), weight loss despite a normal appetite, dull or rough coat, intermittent diarrhea or vomiting, and scooting. Kittens with heavy roundworm burdens can develop a characteristic round belly that looks out of proportion to their thin frame.
Some cats, particularly healthy adults with light infections, show no symptoms at all. The parasites quietly shed eggs without causing obvious illness. This is one reason routine fecal screening matters even when your cat seems perfectly fine.
How Vets Treat Cat Worms
Treatment is straightforward once the type of worm is identified. Deworming medications come in chewable tablets, topical liquids applied to the skin, or oral pastes. Different active ingredients target different parasites, so knowing whether your cat has roundworms, tapeworms, or both determines which product your vet recommends. Some broad-spectrum dewormers cover multiple types at once.
For kittens, deworming typically starts early and happens frequently: every two weeks from about 3 weeks of age through 9 weeks, then monthly until 6 months old. This aggressive schedule exists because kittens can pick up roundworms from their mother’s milk before they’re even old enough for their first vet visit. Adult cats benefit from fecal exams one to two times per year, with deworming as needed based on results and lifestyle. Outdoor cats and those that hunt face higher exposure and generally need more frequent monitoring.
Risk to Humans
Some cat worms can infect people, which is worth knowing if you’re handling litter or if children play in areas where cats defecate. Cat roundworm eggs shed in feces become infectious after a few weeks in soil. If accidentally swallowed (usually by young children who touch contaminated dirt and then their mouths), the larvae can migrate through the body and cause a condition called toxocariasis. In its more serious form, visceral toxocariasis, the larvae travel to organs like the liver or central nervous system, causing fever, coughing, wheezing, and abdominal pain. In rarer cases, a larva reaches the eye and can cause inflammation, retinal damage, or vision loss, typically in just one eye.
The risk is manageable with basic hygiene. Scoop litter boxes daily, since roundworm eggs need time in the environment before they become infectious. Wash your hands after handling litter or gardening in soil where cats may have been. Keep your cat on a regular deworming or screening schedule, and address any visible worms promptly rather than waiting to see if they resolve on their own.