Will Falconer, DVM Moderator
Hey Peter,
Fear subsides with first hand experience of how resilient and resistant your Vital Animal is becoming. And if the wolves and coyotes, exposed to far more mosquitoes and heartworm than your amazingly healthy dog aren't dying of heartworm, well… (and, last I checked, no one was dropping them Heartgard…)
As this parasite, like all, are slow movers, there's no benefit to test more than once yearly. Review that section in the book on the life cycle and how time is on your side.
And consider the worst case: your dog gets heartworm. So? That just means you've got a bit of work to do to help her fight. I think I made it pretty clear in the book that's neither a death sentence nor a need to give toxic chemicals, right? I cure these dogs pretty easily with homeopathy, as I'm sure do my homeopathic colleagues.
All the best. You're doing great work!