Heartworm disease is on the rise across the United States including California and is a serious and potentially fatal condition. Heartworms can reach up to twelve inches long and can live in a dog’s heart, lungs, or blood vessels. In cats, the worms predominantly live in their lungs. One infected mosquito is all it takes to infect a dog or a cat. The good news is that heartworm disease is preventable. We carry a variety of heartworm preventatives and we recommend year-round prevention and annual heartworm testing.