I keep her on heartworm prevention year round also, so I want to make sure this is okay as well. (1800petmeds.com)
It is recommended that dogs be on monthly heartworm prevention year round which can only be purchased in your veterinarian's office. (austinboxerrescue.com)
We recommend heartworm prevention all year around, it only takes one bite from a mosquito to become infected. (redbarnvmc.com)