We got one of these (the stegosaurus) for our 2 7-month-old puppies toy collection, and let me say, they love it!  So much so that we can rarely give it to them as they (play) fight over it until WE can't stand listening to them anymore and take it away.  A great source to focus their chewing, rather than the furniture.  It's lasted 2 teething puppies for about 4 months with only minimal wear.  We had to order another to give them each their own, though, they still opt to fight for each others.