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Heartworm disease is a serious and potentially fatal disease in pets in the United States. It is caused by foot-long worms (heartworms) that live in the heart, lungs and associated blood vessels of affected pets. They cause severe lung disease, heart failure and damage to other organs in the body. Heartworm disease affects dogs, cats and ferrets.

Key Points

  • Puppies under 7 months of age can be started on heartworm prevention.
  • Heartworm infection in cats is harder to detect than in dogs.
  • Ferrets are very susceptible to heartworm disease and the results of infection may be devastating.

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