Yesterday I posted about not using Control on ferrets for fleas. I was thinking of Biospot, which I have heard negative things about. I would not use Biospot on anyone. I am not familiar with Control. HOWEVER, if Control is the product made by Hartz Mountain, I would not use it either. There have been serious problems with some of the Hartz Mtn. flea products. Flea products can be VERY STRONG and can cause severe reactions, even death, in cats and ferrets. I would be very careful with any over the counter flea product on ferrets. Myself I would not use any Hartz Mtn. product. Ronnie in Mass. [Posted in FML issue 2426]