Heartworm disease is very serious for pets, as it can result in heart failure, lung disease and even death. Heartworms are spread through mosquito bites, which results in worms producing offspring inside your pet. These worms live in the heart, lungs and blood vessels of an infected animal. While there is a common thought that heartworm is not a concern in [STATE], this is a misconception—the number of out-of-state animals here makes it indeed a concern!