Stimulate your pet with the Funny Bone. The design of the durable nylon bone & tough polycarbonate treat center provide dogs with an extended chewing experience - the Gnawhide® treats last longer than giving treats alone & dogs are stimulated to chew the toy well after the irresistible treats are gone. Toy unscrews to load treats and clean - the locking mechanism comes with a molded key to easily and effectively clear the treat holding channels. Comes packed with another set of treats. Additional Gnawhide treat strips sold separately.