Have a 11 week old Ridgeback puppies for I bought this toy. She was initially a little cautious, but then it get open right the 1st time all 4 Laden and was pleased with the treats. Well, I think that it is made of plastic, for I have seen such games also made of wood and wood nibbling my bitch particularly fond of. So was a pleasant surprise for them and I can recommend for puppies well.