re: Dog Heartworm Lifecycle has changed?

I’m not sure that i really believe that. I’ll ask a vet i know. I could see heartworms evolving to a shorter life cycle but 45 days to 18 seems like the impossible. I could see 45 days to 30 days.

Instead my opinion is that someone probably wasn’t on time with their monthly treatment.

But also i do know that heartgard isn’t as effective, i know my dog and my parents dog as well as several other people i know who have dogs that tested positive while on heartgard. The general consensus is that pro heart is more effective by a large margin.