Heartworms can be a dangerous disease for dogs and cats as well as other small animals and pocket pets. If you are thinking about bringing a dog like the German Shepherd into your home, please have him checked for heartworms during his first-time vet visit. Heartworms can go undetected if dogs aren’t tested regularly and they can be fatal if not treated promptly. Heartworms often invade the heart, lungs and blood vessels of animals. They can cause lung disease, heart failure, and other organ failures. The best form of treatment is prevention through monthly medications. If the parasite makes its way into your dog it can leave lasting damage even if it’s treated and killed off. Before starting your dog on heartworm preventatives, have your vet Glendale, AZ tests him for heartworms. A negative test means prevention methods can be started. A positive test will require treatment first.