The small white worms you’re seeing near your cat’s rear end are almost certainly tapeworm segments. These rice-sized pieces break off from a larger worm living inside your cat’s intestine and exit through the anus, sometimes wriggling when fresh. It looks alarming, but it’s one of the most common parasitic infections in cats and straightforward to treat.
What You’re Actually Seeing
Tapeworms are long, flat parasites that live in a cat’s small intestine. The most common species in cats can grow over a foot long, but you’ll never see the whole worm. Instead, you see segments called proglottids, which are essentially packets of eggs that break off from the tail end of the worm and pass out through the anus. When fresh, they look like small white grains of rice and may actually wiggle. As they dry out over the next few hours, they shrink, harden, and turn yellowish.
You might spot these segments stuck to the fur around your cat’s back end, on their bedding, or in their litter box. Some cat owners first notice them on a favorite sleeping spot rather than on the cat itself.
Why Tapeworms End Up at the Anus
This is just how tapeworms reproduce. The adult worm anchors its head into the lining of the small intestine and grows by adding segments to its body. Each segment gradually fills with eggs as it matures. When a segment at the far end is fully loaded with eggs, it detaches and travels through the digestive tract until it exits through the anus. The worm is essentially using your cat’s body as a delivery system to spread its eggs into the environment.
The segments are designed to be mobile. Their wriggling motion helps them work their way out, which is why they sometimes appear clinging to the fur around the anus rather than buried in the stool.
How Your Cat Got Tapeworms
The most common tapeworm in cats, Dipylidium caninum, comes from swallowing an infected flea. Here’s the cycle: flea larvae on the ground eat tapeworm eggs from the environment. As the flea matures, the tapeworm develops inside it. When your cat grooms and accidentally swallows that flea, the immature tapeworm is released into the intestine, where it anchors itself and grows into an adult over about one month.
This means that if your cat has tapeworms, your cat almost certainly has (or recently had) fleas, even if you haven’t seen them. Cats are efficient groomers and can remove most fleas before you notice. A single flea is enough to deliver a tapeworm.
Less commonly, cats can pick up a different tapeworm species by eating infected mice, birds, or other small prey. Outdoor and hunting cats are more likely to get this type.
Could It Be Roundworms Instead?
Roundworms look completely different. They’re long (three to five inches), cream-colored, and resemble spaghetti noodles. They’re the most common intestinal parasite in cats overall, affecting 25% to 75% of cats depending on the population, with kittens at the highest risk. Roundworms typically show up in vomit or stool rather than around the anus. If what you’re seeing is small, flat, and rice-like, it’s tapeworm segments. If it’s long, round, and noodle-like, you’re looking at roundworms.
Roundworm eggs are microscopic, so even if you don’t see whole worms, your cat could still be infected. A vet can confirm either type through a stool sample.
Signs Your Cat Has Worms
Beyond the visible segments, cats with worms often scoot their rear end along the floor or carpet. This dragging motion is their attempt to relieve the irritation caused by segments exiting the anus. You might also notice your cat licking or biting at their back end more than usual.
Other signs can include increased appetite without weight gain (the worm is stealing nutrients), a dull coat, mild diarrhea, or a bloated belly in kittens. Many adult cats with light infections show no obvious symptoms at all aside from the segments themselves, which is why the visible worms near the anus are often the first and only clue.
Treatment Is Simple
A deworming medication will kill the worms, usually in a single dose. Common treatments target both tapeworms and roundworms at once. Your vet can provide a tablet that’s given by mouth or mixed into a small amount of food. The medication dissolves the worms inside the intestine, so you typically won’t see dead worms pass afterward.
The critical extra step is flea control. If you treat the tapeworms but don’t eliminate the fleas, your cat will swallow another infected flea during grooming and the cycle restarts within a month. Treating the worms without treating the fleas is the main reason people see tapeworm segments come back again and again.
Can Your Family Catch These Worms?
Tapeworm transmission to humans is possible but rare. It requires accidentally swallowing an infected flea, which is uncommon in adults but occasionally happens with young children who play on contaminated floors. The segments themselves aren’t directly infectious to people.
Roundworms pose a more significant risk. Cats shed roundworm eggs in their stool, and those eggs become infectious after two to four weeks in the environment. Once viable, they can survive in soil for months or even years under the right conditions. People can accidentally ingest them through contaminated soil (gardening, for example) or contact with a dirty litter box. Regular hand washing after handling litter and prompt disposal of cat feces reduces this risk substantially.
Keeping Worms From Coming Back
Veterinary guidelines from the Companion Animal Parasite Council recommend treating adult cats with a broad-spectrum dewormer four times a year, combined with year-round flea prevention. Kittens need a more aggressive schedule: deworming starting at two weeks of age, repeated every two weeks until two months old, then monthly until six months, and quarterly after that.
Fecal testing two to four times per year helps catch infections that aren’t producing visible symptoms. For outdoor cats or those who hunt, more frequent monitoring makes sense since they’re constantly exposed to new sources of infection through prey animals.
Keeping the litter box clean is one of the easiest preventive steps. Scooping daily removes eggs before they have a chance to become infectious (roundworm eggs need two to four weeks in the environment to mature). Combined with consistent flea prevention, this breaks both major transmission cycles and makes reinfection far less likely.