I need to clarify the dosage of the heartworm medication for ferrets listed in the faq. I just had my vet mix up the liquid Ivomec solution from the faq instuctions. We understand it to be .1ml per pound of body weight, and that I can give half of that per half pound, etc. But it was not entirely clear that this is a once per month dosage like you do with cats and dogs. Can someone tell me for sure please? [Posted in FML issue 2167]