How does my cat’s lifestyle affect their risk for heartworm?

Cats that roam and are outside more are a little more at risk of becoming infected with heartworm. It's much less than the risk of a dog. Even so, because heartworm disease is invariably fatal for a cat if it reaches maturity, prevention is paramount.

Indoor cats typically have less likelihood of coming in contact with mosquitoes. In places like Florida, there can still be a few mosquitoes indoors sometimes, but the risk is greater outdoors due to increased contact with mosquitoes.