What is Heartworm Disease? Heartworm disease is caused by a parasite, Dirofilaria immitis. Heartworms are transmitted by mosquitoes and can lead to severe, life threatening disease in both dogs and cats (and ferrets). Through testing and prevention, we can help protect our pets against this serious disease. Heartworm disease is 100% preventable with Heartgard Plus and Interceptors. Heartworms live in the heart and lungs, where they can cause permanent damage- and even death. Treatment of heartworm disease is risky and expensive, but prevention is easy, and year round prevention provides the best means of protection. My cat lives indoors. Do I need to protect him? Indoor cats are not safe from heartworms. According to a recent survey, 55% of cats testing positive for heartworm infection were kept exclusively or mostly indoors. What are the signs of Heartworm Disease? Coughing Vomiting Breathing difficulties Sluggishness Sudden death What should I do to prevent Heartworm Disease? The best course of action, is to use Heartgard Plus on a monthly basis. Heartgard Plus is 100% effective against heartworm, and treats and controls other dangerous parasites. Click to Return to Health Info Page Use the index at the left or click each subject below: Home Staff Services Case Animals Health Info Order! Location Contact Coupon!