You find what look like grains of rice stuck to the fur under her tail, and some of them are moving. That is the most common way worms in cats announce themselves on a homestead, and by the time you see it she has usually been carrying the load for weeks. A cat who hunts is going to pick up worms, and the question is not whether she has them but which ones and how heavy. Knowing what you are looking at tells you whether this is a routine dose or a vet call.
Key Takeaways
How to Tell If a Cat Has Worms
Look at the cat before you look at the stool. A cat carrying a real worm burden loses condition along her spine and hips while her belly stays round or even swells, which is the pot-bellied look people recognise in kittens and miss in adults. Her coat goes dull and stands away from the skin instead of lying flat, and she may eat well and still drop weight, because the worms take the calories before she does.
Then check the two places worms show up. Part the fur under her tail and look for pale segments the size of a rice grain, dried ones look more like sesame seeds and stick to the fur. Turn over what she leaves in the barn and look for whole worms, which usually means roundworm, and for blood or a black tarry look, which points at hookworm.
Some signs send you to the vet the same week rather than to the farm store. Pull her lip up and press the gum: it should blanch white and colour back pink within two seconds, and gums that are pale or slow to refill mean she is losing blood faster than she is making it. Bloody stool, a cat straining without producing, or worms in a kitten under eight weeks all belong in the same category.
The Worms a Hunting Cat Actually Gets
Four worms account for nearly everything you will see in a working cat, and they look different enough that you can usually name them from the yard.
- Tapeworm: flat, segmented, and the segments break off and crawl out around the tail. She gets it by swallowing an infected flea while grooming, or by eating a mouse carrying the larvae. This is the one you see most on a mouser.
- Roundworm: round, pale, and three to five inches long, so they look like spaghetti in vomit or fresh stool. Kittens get them through their mother’s milk, and adults get them from eating rodents.
- Hookworm: too small to see, which is why you diagnose it from the cat rather than the stool. It bites into the gut wall and feeds on blood, so pale gums, weakness, and dark tarry stool are the tells.
- Lungworm: a persistent dry cough and wheeze in a cat with no other sign of illness. She picks it up from eating slugs, snails, or a rodent that ate one, so it turns up in cats hunting damp ground.
Naming the worm matters because no single product covers all four. A dewormer that clears roundworm may do nothing at all for tapeworm, which is the most common reason a treated cat still has segments around her tail a week later. The Cornell Feline Health Center keeps a full rundown of feline gut parasites if you want to match what you are seeing against a description.
Where a Working Cat Picks Them Up
Every mouse she catches is a possible dose. Rodents carry tapeworm larvae and roundworm eggs, and a cat doing the job you brought her home for eats several a week. That is the trade you accept when you keep a mouser, and it is why our guide to what a barn cat actually controls comes with a parasite plan attached rather than a clean bill of health.
Fleas are the other half. A cat swallows a flea while grooming, the flea carries tapeworm larvae, and she has a new tapeworm about three weeks later. You will not get on top of tapeworm without getting on top of fleas, which is why flea prevention on an outdoor cat belongs in the same conversation as deworming.
The barn floor holds the rest. Roundworm and hookworm eggs pass in stool and survive in soil and bedding for months, so a cat reinfects herself from the ground where the last cat went. Cleaning up around the feeding station and turning over damp bedding does more than most people credit.
What to Do Once You Know
Match the product to the worm you identified rather than grabbing whatever the farm store shelves. Praziquantel handles tapeworm, pyrantel handles roundworm and hookworm, and plenty of bottles carry only one of the two. Our guide to choosing a cat dewormer walks through which active ingredient covers what and how often a hunting cat needs treating.
Treat every cat on the place at the same time, not only the one showing segments. Cats sharing a barn share the same ground and the same fleas, so treating one and leaving the others gives the load somewhere to sit and come back from. Worm a group together and clean the bedding the same day.
Take her to the vet instead if she is a kitten, if her gums are pale, if there is blood in the stool, or if she has been treated and the signs are still there in two weeks. A faecal test costs little and tells you exactly which worm you are dealing with, which beats working through products by trial and error on a cat who is already losing ground. Ask for the test if she is thin and you cannot see anything in the stool, because hookworm and lungworm both hide from a visual check.
Keeping the Load Down
Put your working cats on a routine rather than waiting to see segments. Most hunting cats do well on deworming every three months, and a cat killing several rodents a day may need it more often, which is a question for your vet who knows what is active locally. Tie it to something you already do seasonally so it does not slide.
Keep her condition up, because a cat carrying good muscle handles a parasite load that would flatten a thin one. What you put in the bowl matters here, and our guide to feeding working farm cats covers the protein she needs to hold weight while she works. Any new cat coming onto the place gets treated before she meets the others, which is the cheapest thing on this list.
Wash your hands after handling her or cleaning up after her, and keep children out of the areas where cats go. Roundworm and hookworm both pass to people, rarely but seriously, and sandboxes and vegetable beds are the usual route. Covering a sandpit and fencing the vegetable garden solves most of it.
Frequently Asked Questions About Worms in Cats
What Are the First Signs of Worms in Cats?
A dull coat, weight loss along the spine and hips while the belly stays round, and rice-like segments in the fur under the tail. Some cats vomit whole roundworms that look like pale spaghetti. Many cats show no obvious sign at all until the burden is heavy, which is why routine deworming beats waiting for symptoms.
Can You See Worms in Cat Poop?
Often, yes. Roundworms pass whole and look like pale spaghetti three to five inches long, and tapeworm segments look like moving grains of rice. Hookworms are too small to see, so you identify those from pale gums and dark tarry stool rather than from the stool itself.
How Do Indoor and Barn Cats Get Worms?
Barn cats get them mostly from eating rodents and from swallowing fleas while grooming. Kittens get roundworm through their mother’s milk. Eggs also survive in soil and bedding for months, so a cat can reinfect herself from the ground without hunting anything.
Can Humans Catch Worms From Cats?
Roundworm and hookworm can pass to people, rarely but seriously, usually through soil contaminated with cat faeces. Wash your hands after handling cats or cleaning litter, cover sandpits, and keep children out of areas where cats toilet. Tapeworm transmission to humans requires swallowing an infected flea and is very uncommon.
How Often Should a Barn Cat Be Dewormed?
Most working cats do well on a treatment every three months, and a heavy hunter may need it more often. Ask your vet what parasites are active in your area, since regional pressure varies. Treat every cat sharing the barn on the same day, or the ones you skip will reinfect the ones you treated.
