Combine a dog"s natural drive to chew with a problem-solving challenge and you have the most revolutionary boredom buster of all time -seamsters. We"ve designed a rubber toy that dogs are actually interested in. Long, thin strips of rawhide are threaded through deep, reinforced slotted holes in the rubber shells. The dried and hardened rawhide becomes a tough seam that challenges a dog to destroy" it. Non-toxic natural rubber and knot-free rawhide."