I have always given my puppy her heartworm preventative medication. If I miss it this month, will it harm her? Thank you in advance
I wasn’t planning on missing, but I didn’t have a car to get to the vet. Thanks anyways

The best answer is by :
Stacey :
It depends on where you live. Very few areas in the continental U.S. require year round heartworm treatment because the temperature is too low for the transmission of heartworm larvae. The larvae require approximately 30 consecutive days of 60-degree weather where the temperature does not dip below 57F (14C) in order to reach this condition. Check out this link for a geographic map and more information.

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