Keep your inquisitive pup engaged and entertained with the Nina Ottoson Outward Hound A-Maze Ball Puzzle & Treat Maze Interactive Dog Toy. This three-in-one puzzle ball features a treat ball, a tennis ball, and a challenging maze ball for extended play. It is a treat-dispensing, true boredom buster that will keep your pup busy and entertained—paw-fect for nose work, scent games, problem-solving, and tapping into his natural foraging instincts. Playing with this toy gives your pal mental, sensory and physical stimulation, releases stress, channels energy, and minimizes boredom-induced behaviors. It can also be used with a standard two and a half inch tennis ball (sold separately) or Outward Hound's medium-sized Squeaker Ballz dog tennis balls (sold separately). This level two puzzle is fun for dogs of all ages, sizes, and breeds. For safety, make sure to choose a toy that is the appropriate size and level for your pup and always supervise your dog while he plays.