[Sukie note, Prologue: a person wrote asking about starting a medical routine since the ferrets are in a an area with heartworm.] ------- I do not recommend using Revolution in ferrets I'm a veterinarian and I don't use it on my dogs or cats Its actually supposed to be very safe, ect BUT Why use extra drugs when you don't have too ? like taking antibiotics for viral infections in my mind. You should test for heartworms before using it - or ivermectin even if used topically. For a ferret you probably don't even have to kill off the whole worm before you get serious problems. for flea problems I recommend Advantage for ear mites well they are hard to kill. [Sukie note: This FHl ( http://groups.yahoo.com/group/Ferret-Health-list ) post is by Dr. Ben Otten, vet. Much more on this topic is in the FHL and FML records.] [Posted in FML issue 3541]