Heartworm disease is caused by a long spaghetti like worm that lives in the right side of the heart in infected animals. The worm obstructs the right side of the heart and can cause heart failure. The larvae worm is transmitted by mosquitoes. Treatment of heartworm disease can be complicated, thus, a stringent prevention program is strongly recommended.
Heartworm prevention comes in tablet form and topical application. Puppies are usually started on heartworm prevention at 6 weeks of age and this is continued monthly. Dogs over the age of one may receive a yearly injection.
Heartworm prevention for cats is usually in the form of a monthly topical application.