Parasites in Cats: Worms, Mites, Ticks, & Fleas

Learn Act
  • You can’t treat heartworms in your cat, you can only prevent them

  • Ear mites are highly contagious and can move from cat to cat

  • Some internal parasites can be transmitted to humans

The Truth about Parasites in Cats

Parasites are organisms that thrive by feeding off of other creatures. Cats can easily fall prey to both internal and external parasites, which pose different challenges when it comes to detection. A close inspection of your cat's skin might uncover traces of external parasites such as ear mites and fleas. But internal parasites, such as ringworms or coccidia, may require some tests to determine medication.

Discover Which Cat Parasite Risks Exist in Your Area

Parasite Prevalence Maps

Use this Parasite Prevalence Maps by the Companion Animal Parasite Council (CAPC)* to get important information about your region’s parasite risk.

*Images courtesy of the Companion Animal Parasite Council (CAPC)

Some infected cats have no symptoms. Although infrequent, sudden death is a reported occurrence in cats, as they hide very well more subtle symptoms. The only way to detect and properly treat internal parasites is through testing.

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There are many parasites that can be harmful to your cat’s health. Let’s take a closer look at some of them.

Worms in Cats

Heartworms
These tiny worms live inside the blood vessels, and travel to the cat’s lungs. Undetected, they can cause severe health problems and even death. They are transmitted through mosquito bites which means even your indoor cat could be at risk.

Roundworms
Known to cause life-threatening problems in kittens, these large bodied worms average 3-6 inches in length. They do not attach to the wall of the intestine, as some intestinal parasites do- instead they “swim” freely within the intestine. Known to cause abdominal discomfort and vomiting, roundworms are easily treated if detected early enough.

Hookworms
The name “hookworm” is derived from the hook-like mouthparts these parasites use to anchor themselves on the lining of the intestinal wall. So small, they are barely visible to the naked eye, but they feed on the tissue fluids and blood of their host.

Tapeworms
Cats commonly contract tapeworms via accidentally ingested fleas. Once the flea is digested by the cat’s intestine, the tapeworm is released into the cat’s system. Eventually segments of the worm pass in the cat’s feces and are visible to the pet owner.

Skin Diseases and Parasites in Cats

Ringworm
Surprisingly, ringworm is not a true worm, but rather a type of fungus. Usually, it doesn’t cause discomfort but it can be easily transmitted to other cats and even humans. Left untreated, it can weaken your cat’s immune system and make it easier for her to contract other, more serious, diseases.

Ticks
They are found in grassy or wooded areas and can attach themselves to you and your pet as you pass by. Although a tick’s bite does not itself pose a direct threat to your pet’s health, it can transmit serious (and sometimes fatal) diseases such as Lyme disease and Rocky Mountain fever.

Ear Mites
As these microscopic parasites feed in a cat’s ear canal, they cause intense itching. A cat suffering from ear mites may be seen repeatedly scratching at her ears or violently shaking her head. If you see dark flecks resembling coffee grounds in your cat’s ears, these are the mites' droppings. Contact your vet for ear drops.

Fleas
Fleas can make any cat’s life miserable (and their family’s)! These small, blood-sucking insects like to feed on your cat and live anywhere your cat does. Fleas can quickly cause a long-lasting, major infestation in your home. Not only can fleabites cause discomfort, itchiness and severe skin reactions, they can potentially transmit tapeworms if accidentally ingested by your cat.

Other Internal Parasitic Cat Diseases

Coccidia
Coccidia are not parasitic intestinal worms. They are microscopic parasites that live within cells of the intestinal lining. Because they live in the intestinal tract and commonly cause diarrhea, they are often confused with worms. In kittens and debilitated adult cats, coccidiosis may cause severe, watery diarrhea, dehydration, abdominal distress, and vomiting.

Three Ways to Protect Against Parasites in Cats


Get your Cat Tested Regularly
While it’s fairly common for a cat to become infected with an internal or external parasite at some point, early treatment is crucial. A harmless parasite left untreated could eventually cause a life-threatening illness for your cat and pose a health risk to your family.

Focus on Prevention First
Preventative medicine is much better option than treatment later. Getting your kitten or cat vaccinated and de-wormed regularly allows her immune system to thrive, which most likely translates to your cat needing less care later. Adult cats also benefit from fecal examinations - which allow your vet to diagnose parasites not controlled by monthly medications.

Annual Checkup to Stay Healthy
Bringing your cat to the veterinarian for regular parasite checkups is one of the most important things you can do to keep your pet, and your family, healthy. We offer different programs specifically designed for your cat’s stage of life. Schedule an appointment to find out more.

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Learn More About How to Prevent and Treat Parasites »

From Our Pet Health Library

  • Heartworm is 99.9% preventable with safe and effective medicines

  • Fleas can spread tapeworm, cause skin allergies, anemia and hair loss

  • Humans are at risk of roundworms and other parasites from infected feces

Tips on Preventing and Treating Parasites in Cats

    Cat Parasite Prevention Tips
  • Have your cat examined at least annually by a veterinarian
  • Ensure your pet has heartworm tests conducted periodically
  • Feed your cat a commercially prepared and balanced diet to keep her healthy and minimize exposure to parasite eggs

The Key to Treating Your Cat’s Parasites
If your cat does happen to contract a parasite, the best course of action is to treat quickly and completely. Treatment will vary depending on whether the parasite is one that lives outside the body such as fleas, ticks and mites or inside the body, like tapeworms, heartworms or ringworms. Though some parasites, like ticks, can be treated with shampoos and powders from the pet store, most parasites require a prescription from your veterinarian.

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Vethical products for cats

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VCA Home Delivery - We Make it Easy to Remember!
Did you know that one of the biggest hurdles in preventing parasite infestation is making sure that protection is administered regularly? To make sure you don’t forget your cat’s medication, VCA offers you convenient home delivery service!

    VCA Home Delivery advantage:
  • Single-dose, monthly delivery
  • Pay as you go
  • You don’t pay more than in the hospital
  • No more stickers, calendars or emails, VCA Home Delivery is your best reminder
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  • PLUS get a FREE semi-annual health exam**

* Ask for details.
** Valid with purchase of Flea, Tick and/or Heartworm monthly delivery. Some conditions apply. Ask for details.

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