Level 2 Intermediate dog puzzle ball great for pets with little to NINA OTTOSSON puzzle experience; involves multiple one-step actions.Helps reduce dog anxiety and redirect unwanted behaviors like excessive barking, chewing, and digging in a fun and exciting wayThree toys in one with multiple ways to play; dogs roll the A-Maze Ball to remove the smaller balls, then roll the treat ball to release treats;Includes a tennis ball and a treat ball; compatible with 2.5 in tennis balls