Canine heartworm disease is transmitted by infected mosquitoes.
In the worst case scenario, it results in a fatal worm infestation in the heart and blood vessels of an infected dog.
Fortunately, heartworm disease can be prevented. It can also be successfully treated when caught in time.
The American Heartworm Society (AHS), an organization that studies the disease, its treatment and prevention, recommends yearly heartworm testing for all dogs. The AHS also recommends year-round chemical preventives for every dog over the age of eight weeks, regardless of where the dog lives.