"I bought this collar for my ferret, to keep track of him whenever he is loose and it works great. Alot of people say that collars are not for ferrets, but they are all diffrent and they don't have the same attitudes or actions. My ferret likes playing with the bell on his collar and has yet to slip out of it, even when I make it really loose. It is not that expensive, so give it a try, see if your ferret or small animal can keep it on."