Fleas, ticks, and heartworms are all serious threats to any dog and all can be caught while a dog plays in its own backyard. All three parasites can cause serious illness in a dog and many diseases can even be spread to humans and other pets in the household. While getting rid of fleas and ticks is fairly easy, treating heartworm is notoriously difficult and can even be dangerous to a dog. The best way to manage heartworm, tic...