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Everything You Need to Know about Intestinal Parasites in Dogs and Cats

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The most common intestinal worms in pets.
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Dog and cat laying their heads down.

Intestinal worms aren’t just a nuisance that can cause your dog or cat discomfort. They can pose health risks for your pet ranging from mild to serious. Knowing how your pet can be exposed to intestinal parasites and how to treat current problems is important to help reduce the risk to your pet.

What Kinds of Intestinal Worms Do Dogs and Cats Get?

The most common types of worms in cats and dogs are tapeworms, roundworms, hookworms and whipworms (dogs only). Read on to learn how pets and people can pick up intestinal worms and the symptoms to watch for.

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1. Hookworms

Hookworms are found in both dogs and cats. These worms latch onto the lining of your pet’s intestine and feed on their blood.

  • What are the symptoms of hookworms?: Adult animals may not show any symptoms, but in younger animals, diarrhea containing blood and anemia may occur.
  • How do dogs and cats get hookworms?: Hookworms can be picked up if your pet eats or walks on soil containing hookworm larvae.
  • How can people get hookworms?: If people walk barefoot over soil containing hookworm larvae, the larvae can burrow into the skin and cause intense itching. 
Drontal® Plus (praziquantel/pyrantel pamoate/febantel)
Drontal® Plus (praziquantel/pyrantel pamoate/febantel)
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Close-up of pet infected with long, white and spaghetti-like roundworms.

2. Roundworms

Long, white and spaghetti-like, roundworms are one of the most common intestinal parasites found in both cats and dogs.

  • What are the symptoms of roundworms?: Adult dogs and cats may show no obvious signs, but puppies and kittens can be more severely affected. Symptoms can include vomiting, diarrhea, lethargy and poor coat condition, and young animals may have a potbelly and slow growth.
  • How do dogs and cats get roundworms?: Infected pets pass roundworm eggs through their feces, which find their way into the soil, where other pets are at risk of eating the eggs and restarting the cycle.
  • How can people get roundworms?: If people accidentally swallow these eggs, the larvae of this parasite can travel in our bodies and cause disease.
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Close-up of a segmented tapeworm.

3. Tapeworms

Tapeworms are segmented worms that live in the small intestine of infected cats and dogs. Tapeworms can sometimes be seen in the pet’s feces, resembling tiny, crawling rice grains.

  • What are the symptoms of tapeworms?: Most pets don’t show any clinical signs of a tapeworm infestation, though dogs may show signs such as scooting, irritation around the anus and unexplained weight loss. In cats, weight loss, tapeworm segments around the anus and consistent vomiting can all be signs.
  • How do dogs and cats get tapeworms?: Segments containing eggs are released from the worm and pass out into the pet’s feces. The most common tapeworm is called the “flea tapeworm,” and as its name suggests, it is contracted when pets swallow infected adult fleas.
  • How can people get tapeworms?: Though rare, if a human swallows an infected flea, they can get tapeworm.
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Quad Dewormer (praziquantel/pyrantel pamoate/febantel) Chewable Tablets for Dogs
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Close-up of an infected pet’s intestines infested with whipworms.

4. Whipworms

Whipworm affects dogs. Whipworms resemble whips, with a thicker front end and a longer, thinner back end. This worm infects adult dogs more often than puppies.

  • What are the symptoms of whipworm?: If low numbers of worms are present, pets may not show symptoms. In heavy infestations, the worms cause damage to the intestines with their whip-like tails, which can lead to diarrhea containing blood.
  • How do dogs get whipworm?: Pets prone to rummaging in the soil can accidentally ingest whipworm eggs that have leeched into the ground from an infected animal’s feces.
  • How can people get whipworm?: Dog whipworm is not considered a zoonotic threat; in other words, there is little risk of catching this parasite from your pet.

CONCERNED ABOUT HEARTWORMS?

They can infect your pet, too, but are not intestinal worms. Rather, they live in your cat's or dog's lungs and heart. Visit our heartworm education section for more information about deadly heartworm disease.

How to Help Prevent Intestinal Worms in Your Dog and Cat

Worming your dog or cat is recommended to help protect them from the potentially harmful effects of intestinal parasites. There are a variety of effective dewormers, including tablets and spot-on treatments, available at specialty pet stores or through your vet.

By taking the proper preventive measures and knowing how to recognize the signs of worms in your pet, you can make sure your dog or cat spends less time dealing with the discomfort of having worms — and more time going for walks, playing with toys and spending quality time with your family.
 

Profender® (emodepside/praziquantel) Topical Solution
Profender® (emodepside/praziquantel) Topical Solution
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