DURABLE: Tough nylon and natural rubber to stand up to aggressive chewing; Hard chew strength is suitable even for determined chewers REDIRECT CHEWING INSTINCT: Helps redirect potentially destructive chewing behavior into positive playtime TASTY TREATS: Toy comes with 6 free natural rawhide PetSafe Busy Buddy Treat rings; Refillable: Uses size B treat ring refills, sold separately EXTEND PLAYTIME: Nylon bone and rubber ball firmly grip Busy Buddy treat rings to keep dogs motivated to play longer SIZE INFORMATION: For dogs 10 to 50 lb. and over 6 months DISHWASHER SAFE: Top rack only