[pitlove]

For me personally, I prefer to use a heartworm prevention that only contains the ingredient that kills off the heartworm (Ivermectin, Moxidectin etc). I also give flea and heartworm meds separately.

But considering I live in the South and we haven’t had a real winter in a few years down here, I do heartworm prevention all year round. I know some don’t, who live in states where there is a real winter. That is something I would talk with your vet about.