Vets make money on drugs. That's not news.
If they really felt that heartworm cure pills were not necessary most of the time then they would not give them to their own dogs.
If you wait until a test is positive it is too late to clear the larvae with one dose. Again, that is slow kill and is not appropriate.
Dogs in Michigan (a 7-11 month state) were testing positive when this protocol was followed. You can do your calendar calculations if you choose but the fact is they do not take into account resistance, changes over the past 15 years, environments where mosquitos have survived out of the cold, and clinical experience.
It does not have to be goven every 30 days, but every 60 is sometimes not enough. So when do you suggest? The minute before it is too late? I don't cut it that close because it is not safe. BUT there is no mass panic here if we are a bit late.
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