My boys love all kinds of rope toys. I've also bought some sterilized bones from petsmart. They have two kinds, plain ones and stuffed ones. I don't like the plain ones, Boris started to break chuncks off them so I stopped giving them. They love the stuffed ones, and they seem to last forever. It's around $4.50 I believe, and I've had them for 2 months now... not a dent, nothing. My only issue is that the stuff they use to stuff them isn't really good (syrop, sugar etc), but they lick it out in one hour anyway. But it's what they prefer chewing.