This IQ Ball is one of Pet Zone's brain toys for dogs that provide a challenging way to dispense treats. Just fill the ball, select the adjustable difficulty level and let your dog roll and play with the ball to figure out how to get the tasty morsels inside. An interactive dog toy like this one rewards your dog for physical and mental activity, keeping them engaged, happy, and healthy. Not intended for toy breeds or aggressive chewers. For breeds 40 – 90 Lbs (Golden Retreiver, German Shepherd or similar breeds). Ensure dogs or cat’s jaw is larger than opening of treat ball.