Instead of choosing people to attack based on their supposed lack of credibility, why don't you attack the actual facts?
Statements like "Ohmygod, this is so false," or "That is simply not true!" etc, simply don't fly in the face of
SCIENTIFIC FACT. Nor does "I've been giving my dog her heartworm medicine once a month and she never got heartworms" qualifies as a logical conclusion that you're following the optimal regimen for heartwarm control.
Here is the research paper on heartworm disease. Read it and feel free to post here if you have any questions.