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Do dogs really need heartworm prevention medication year-round?

Updated on September 23rd, 2025

Do I need to give my dog heartworm prevention year-round?

1 Answer

Most Helpful Answer

Lauren Jones VMD

Answered By Lauren Jones VMD

Veterinarian

Published on September 17th, 2019

Yes. Heartworm preventive medications work by intermittently killing the heartworm larvae that may have been transmitted to your dog by infected mosquitoes. As a result, heartworm preventives are killing larvae that may have infected a dog in the previous two months. Without the consistent administration of heartworm preventive medications, heartworm larvae can mature and cause serious signs of disease. In order to avoid this serious and life-threatening infection, it is crucial to give your dog heartworm preventive medication consistently year-round.

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