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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