Worms are one of those things almost every cat owner deals with at some point, and one of the least dramatic to actually treat once you know what you are looking at. The tricky part is that a lot of cats carrying worms show no obvious signs at all, especially with a light burden, so knowing the handful of things worth checking for matters more than waiting for your cat to look unwell.
The signs worth checking for
The clearest sign is seeing the worms themselves. Tapeworm segments look like small grains of rice, sometimes still moving, and show up stuck to the fur under the tail more often than in the litter tray. Once dried out, they shrink down to something closer to a sesame seed. Roundworms are longer, thinner, and pale, closer to a strand of spaghetti, and turn up in stool or occasionally vomit rather than around the tail.
Beyond visible worms, watch for a potbellied appearance, most obvious in kittens with a heavy roundworm burden, alongside a dull coat, weight loss despite a normal or even increased appetite, similar in pattern to what is covered in why is my cat losing weight, or ongoing diarrhea that does not clear up. Scooting or excessive licking around the anus can also point to tapeworms causing irritation there.
How cats actually get worms
Kittens usually start out with roundworms already, either passed on before birth or through their mother’s milk, which is why they need deworming on a repeat schedule in their first few months rather than just once. In adult cats, fleas are the most common route to tapeworms specifically: a cat grooming itself swallows an infected flea, and the flea is what carries the tapeworm larvae, not the worm passing directly between cats. This is one of the reasons flea control matters even for a cat that never seems bothered by fleas, and it is worth reading alongside why is my cat losing fur if you are dealing with both fleas and hair loss at once.
Roundworms and hookworms more often come from hunting, eating an infected rodent, bird, or insect, or from contact with soil or litter contaminated by another animal’s droppings. This is why an indoor cat that occasionally catches something, or one that shares a garden with outdoor cats, is not risk-free just because it stays inside most of the time.
Diagnosis and treatment
A vet confirms worms with a fecal test, checking a stool sample under a microscope for eggs, since eggs are shed intermittently and are not always visible even when a cat definitely has worms. Treatment itself is usually straightforward, a dewormer matched to the specific type of worm found or suspected, since not every product treats every type. Tapeworm treatments are available over the counter in some places, but roundworm and hookworm treatment is best guided by your vet, partly because of the zoonotic risk and partly because dosing correctly matters more than it might seem.
Keeping worms from coming back
Year-round flea prevention does most of the work against tapeworms, since removing the flea removes the route in. A flea comb run through the coat regularly helps you catch an early flea problem before it becomes a worm problem too. For cats that hunt, there is no way to fully stop it short of keeping them in, so a more frequent deworming schedule from your vet is the realistic compromise rather than trying to eliminate every mouse in the neighbourhood.
Most worm infestations clear up completely with the right treatment and cause no lasting harm. The thing worth taking seriously is the pattern, a cat that keeps needing retreatment, is losing weight despite eating well, or a kitten with a visibly swollen belly, since those are the situations where it is worth working out why the worms keep coming back rather than just treating the same episode on repeat.
Common questions
- Can indoor cats get worms?
- Yes. Fleas carried in on another pet or on your own clothing can infect an entirely indoor cat with tapeworms, since the flea is what actually carries the tapeworm larvae. An indoor cat that catches the odd mouse or insect is also at risk of roundworms picked up from prey. Indoor-only is lower risk, not no risk.
- What do worms look like in cat poop?
- Tapeworm segments look like small grains of rice, sometimes moving, and are most often spotted stuck to the fur under the tail rather than in the litter tray itself. Dried segments look more like sesame seeds. Roundworms are longer and thinner, similar to strands of spaghetti, and turn up in stool or occasionally in vomit. A vet can also find worm eggs on a fecal test even when nothing is visible to you.
- Can I get worms from my cat?
- It is possible but uncommon with normal hygiene. Roundworm eggs shed in an infected cat's feces can occasionally infect people, particularly young children, through accidental hand-to-mouth contact after touching contaminated soil or litter. Scoop the litter tray daily, wash your hands after, and keep children's sandpits covered, and the real-world risk stays low.
- How often should I deworm my cat?
- Kittens need deworming several times in their first few months, since most are born with or pick up roundworms early from their mother. Adult cats are typically dewormed every one to three months if they hunt or go outside, and roughly twice a year if they are strictly indoor with good flea control. Ask your vet for a schedule suited to your specific cat rather than guessing.
