Tammy: We started seeing some fleas on our guys early in the summer, too. Our vet recommended Revolution because he said it will help prevent ear mites as well as fleas. Two for one seemed like a good idea to me. We just use four drops on each ferret. I don't think we've seen a single flea since we started using it. The ferrets don't seem crazy about the smell, but it's gone in just a few seconds (as far as my insensitive nose can tell). So far, we haven't had any adverse reactions. Judy Chelsea, Alabama Caring for Possum, Emory and various other furry creatures. Remembering Pancho, Ciscso, Trucker and Pedro [Posted in FML 5729]