I also have a ferret that has hairballs. A friend of mine is a vet tech, and she knows all about this stuff. So I asked her what to do about it, and she talked to the vet at the clinic she works at, and he gave us a gel that they use on cats, to give to our ferts. On the instructions it says a teaspoon per day, but with the ferts it is only a little on the tip of the finger. 1 treat for ferts may be too much. Just tell your friend to call her vet (or if she doesnt have one, a local vet) and ask. That is the best thing she can do. :) Good luck! ~Barbara, Kodi (the love bug), and Hope (the demon child)~ [Posted in FML issue 3745]