How much do you give for preventative vs treatment?
For monthly preventative she prescribes:
1cc ivermectin mixed with 9cc's of propylene glycol --- give 1cc of this mix per 40 lbs.
Treatment varies per dog... consult your vet.
The dog i'm treating now is 12cc's ivermectin mixed with 48cc's of propylene glycol.
I'm giving him 1 1/2cc's of this mix per week for six months and then she'll test again.
This is based on using the 1% ivermectin for cattle/swine.
I've always used it straight by using the 1/10th cc per 10 lbs for preventative and all the dogs i've raised have been heartworm free.