those ivermectin dosages ( 150-200 mcg/kg ) you referenced a day or so ago, was that PO? SQ? IM? other?
i have ivermectin injectable for cattle/swine. 1% sterile solution. (1 ml = 10 mg )
i have used it PO for internal and external parasites in dogs for years. one ml/100 lb of dog, monthly – no fleas, no ticks, no worms, no hassle.