The 6 Best Cat Dewormers of 2023

Types of worms and their signs and symptoms

Cornell University veterinarians estimate that as many as 45% of cats have intestinal parasites at any given time. In adult cats, parasite infestations may cause mild to moderate digestive symptoms like vomiting, diarrhea, and gas. However, heavy infestations, especially in kittens, can lead to more severe digestive symptoms, weight loss, anemia, malnutrition, and restricted growth.

"We'll see cats coming in, for example, if they've been in a feral situation. They are anemic, bloated, they have chronic diarrhea and vomiting, their coats are brittle and unkempt, and they can be very depressed," Jeffer said. "Kittens can actually die from parasite infestations."

Some of the most common worms seen in cats are roundworms, tapeworms, and hookworms.

Roundworms: Common in cats, especially in kittens, roundworms are large (3 to 6 inches), smooth, and round-bodied. You might not notice symptoms, particularly if your cat has only a few roundworms. In kittens, large numbers of worms may cause a pot-bellied appearance, vomiting, diarrhea, low appetite, dull coat, and restricted growth. You might also see roundworms in your cat's stool or vomit.

Tapeworms: If you see something in your cat's feces that resembles grains of white rice, or you notice them licking or biting the area under their tail, they could have a tapeworm infestation. Cats contract tapeworms when they ingest an infected adult flea. As the tapeworm grows, segments break off and pass in your cat's stool.

"Probably the most common kind of worm that pet owners are going to notice is a tapeworm," Jeffers says. "The cat might have other ailments that need to be addressed, so there are a lot of reasons to bring your cat to the vet to sort out which worm it is and to make sure there aren't secondary issues that are resulting from that infection."

Hookworms: Tiny worms nearly invisible without the assistance of a microscope, hookworms are blood-sucking parasites that attach to the wall of the intestines. Signs of hookworm infection in cats include anemia, weight loss, and dull coat. Hookworm-infested cats also sometimes have dark, tarry-looking stools.

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