I have had ferrets since 1996, been a rescue since the summer of 1998 and a small private breeder since the end of 1998. I too had been looking for an indistructble toy for the ferrets of all ages and I can honestly say that the original "Kong" ( NOT the look a like Four Paws makes) is one of the best safe toys out there for ferrets. I use the black ones and the red ones. What I do with the red ones is trim the small lip edge off of the bottom of the red ones so there would be no chance for the ferrets to chew it off. I still have the original one I bought for the ferrets 13-14yrs ago and it is still intact. One of my ferrets Scooby (RIP) used to carry the large black Kong around and hide it, it was his favorite toy. I buy the ones that has the dog on the tag as it is the same exact toy as the one with the ferret on the tag, the only difference is the price. Another good safe toy for ferrets to chew on is the Nyla Bone toy for dogs, not the hard one but the one that is a little softer and more translucient. This one I have had for about 11-12yrs and is still intact and my femals love playing with and hiding them. These two brands of toys have been tested with ferrets I have had from the age of 5wks to 14yrs old. Debi Fuzzy Loving Ferrets [Posted in FML 6651]