Easily fill with your dog's favorite kibble or small treat for extra puzzling play! Kibble can easily be inserted in one end of the AniBoneNanza through a self-closing insert hole. Unlike most kibble dispensers from which a treat can just spill out of an open hole, the dental rope wraps around the open kibble dispensing hole in the middle of the rubber bone to prevent treat from coming out too fast. While you dog works around the puzzling rope, the dental rope also helps stimulate and clean your dog's teeth. Made of Super Durable Rubber and a 50% cotton / 50% polyester dental rope. WIGGLE, JIGGLE, get the KIBBLE!