I use it and I think its great. I use 0.1ml per 3kg body weight. Ive used it on westies,Glenn of Imaals, beagle, shitzu.I have a terrier with border lakeland and russel in him and no prob. It is very strong and Ive been told it is fatal to breeds with collie in them. Ive never used it on collie types so I cant confirm this. It does internal and external parasites, Ive used it on reptiles aswell. I think its brilliant.It is very strong so I lean on the side of underdose than over dose. When I do a dog for the first time I do have a little thought I hope I shouldnt have done that. Most dogs get