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. We do not recommend this particular model for aggressive chewers.