RADIO SYSTEMS CORP. (PET SAFE) - BUSY BUDDY JACK SMALL Excellent for tough chewers Comes with 4 gnawhide rings Refillable with premier gnawhide or cornstarch rings Durable treat holding chew toy for dogs Nylon knobs and rubber sprockets firmly grip Busy Buddy treat rings to keep dogs motivated to play longer For dogs 8 to 20 lbs. and over 6 months Helps redirect potentially destructive chewing behavior into positive playtime Hard chew strength, uses Size A treat ring refills