The durable nylon and rubber Nobbly Nubbly™ toy gives your dog multiple treat options for longer lasting playtime. Use with Busy Buddy® treat rings or fill the grooves with your dog's favourite spreadable treat, such as peanut butter or cheese. Perfect for dogs who like to chew, the toy rewards your dog for appropriate chewing. To add treat rings, unscrew the ends and remove the purple center section. Slide a ring on both ends of the purple center section. Screw the ends back together and let the fun begin! For more variety, fill the grooves on the center section with your dog's favourite smearable treat.