Thank you to Todd and Alicia. The ferret in question is about six years old, had the left out a couple years ago. I was asking for the owner who doesn't have internet. The ferret, Buttercup, has been through a few homes and is staying there.The largest vet hospital here charges $30 for a one month, while the smaller clinics have to order the four month at $220. One friend said she used the one month a while ago and it didn't work so thought I would check. Carol Owens, Ferret Friends, Inc. Tucson A 501c3 organization [Posted in FML 5465]