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Heartworm Awareness FAQs

Heartworms are among the most dangerous parasitic worms that infect dogs. Hundreds of thousands of cases of canine heartworm disease are reported in the US every year. The disease is passed from infected dogs to other dogs by mosquitoes. That means all of these dogs are at risk for heartworm disease.

What is heartworm disease?
Heartworm disease in dogs (dirofilariasis) is a serious and potentially fatal disease. Heartworms spend their adult lives in the right side of the heart and the large blood vessels that connect the heart to the lungs. The adult worms block the heart and major blood vessels leading from the heart to the lungs, liver, and kidneys.

Heartworms are among the most dangerous parasitic worms that infect dogs