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Cats + Parasites

  • An average cat experiences only minor skin irritation in response to flea bites, but a cat with flea allergies will have a severe reaction to even a single flea bite. Affected cats experience intense itching and will chew, lick, or scratch the affected sites nonstop, leading to hair loss, sores, and scabs. Strict flea control is essential for treatment and prevention.

  • Fleas are the most common nuisance and parasite affecting cats, and an infestation can lead to serious health problems. Homes with carpets and central heating provide ideal conditions for the year-round growth of fleas. This handout outlines flea control options for your cat and your home.

  • Fluralaner (brand name Bravecto®) is given by mouth or applied topically to treat and prevent flea and tick infestations in dogs and cats. It is sometimes used off label to treat sarcoptic mange, demodectic mange, or ear mites in dogs and cats. It is also sometimes used for skin and ear mites in rabbits and hedgehogs.

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  • Giardiasis is an intestinal infection caused by a microscopic protozoan. The parasites attach themselves to the intestinal wall and the damage causes an acute, sudden onset of foul-smelling diarrhea. Diagnosis may be by routine fecal flotation or presumptively based on clinical signs. Fenbendazole and metronidazole are the drugs most commonly used to kill Giardia. Giardiasis is the most common intestinal parasitic infection of man and can potentially be passed from cats to humans.

  • Harvest mites, also known as red bugs, trombiculid mites, scrub-itch mites, berry bugs or, in their larval stage, as chiggers, are mites commonly found in forests and grasslands. Larval stages affect warm-blooded animals and cause a very itchy skin reaction.

  • Heartworms (Dirofilaria immitis) are blood-borne parasites that reside in the heart or nearby large blood vessels of infected animals. Veterinarians now strongly recommend that all cats receive year-round monthly heartworm preventives.

  • Heartworm disease is caused by a parasite that typically affects dogs but can occasionally occur in cats. Heartworm is usually diagnosed with a simple blood test. Unlike in dogs, treatment options are limited in cats. Heartworm preventives are available for cats. Your veterinarian can advise you on the best prevention program for your cat.

  • There is no drug approved for treating heartworms in cats and surgical removal is generally the best option. Veterinarians now strongly recommend that all cats receive heartworm preventative.

  • Hookworm is a parasitic infection of the gastrointestinal tract. The parasites have hook-like mouthparts they use to anchor themselves to the lining of the intestinal wall. This handout outlines clinical signs, diagnosis, treatment, and prevention.