The Outward Hound Nina Ottosson Topsy Treat Ball is two toys in one for interactive fun! Featuring a treat ball and a maze ball for a problem-solving challenge and extended play, this puzzle ball keeps your dog busy and mentally stimulated for unrivaled dog enrichment. As a treat-dispensing dog toy, it is a true boredom buster that will keep your dog busy and entertained, perfect for nose work, scent games, and tapping into natural instincts. What's more, the mental stimulation achieved when solving dog puzzles benefits the body and the mind – just 15 minutes of mental stimulation for dogs is equal to 30 minutes of physical activity. Your dog will exercise while they play, achieve the sensory activation they crave, and release their animal instincts as they "hunt" and forage for dog treats. This helps your dog release stress, channel energy, and minimize boredom-induced behaviors. The Topsy Treat Ball is great for small, medium, and large dogs and can also be used with a standard 2.5" tennis ball or Outward Hound's medium-sized Squeaker Ballz dog tennis balls. This Level 1 puzzle is fun for all dogs, regardless of age, size, or breed.