Different from other types of worms, heartworms develop in the heart and blood vessels of dogs. They are transmitted by mosquitoes carrying heartworm larvae in canines. Heartworms look like spaghetti and can grow up to be up to a foot long. When present in large numbers, heartworms can cause irreversible damage to the heart and vessels eventually resulting in heart failure and pulmonary hypertension. Ensure your pet’s health with effective heartworm treatment for dogs. Shop VetSupply for top-rated heartworm preventatives at the best prices!