Heartworm Protection for Dogs: A Complete Guide for Pet Owners in the US Heartworm protection for dogs is an essential part of responsible pet care in the United States. Heartworm disease is a serious condition that can affect a dog's heart, lungs, and blood vessels, potentially leading to severe health complications if left untreated. Since mosquitoes are responsible for transmitting heartworms, dogs living in many parts of the country remain at risk throughout...