PetSafe Busy Buddy Gnawbrush Pet Chew Toy Rubber and bristly surfaces help clean teeth while dogs chew^Holes in the center line dispense gel/paste treats^Highly compressible rubber for medium strength chewers Compressible treat dispensing rubber dog toy with a variety of surfaces to help clean teeth while dogs chew Busy Sticks treats break into small pieces and randomly dispense to keep dogs motivated to play longer Load with smearable treats like peanut butter for more variety For dogs over 50 lbs. Medium chew strength, uses Medium/Large Busy Sticks treat refills