PLAY TIME CHALLENGE: The ultimate exercise for learning and playtime, the Nina Ottosson Dog Worker can be filled with treats to exercise your dog’s mind, and strengthen the bond between you and your dog through interactive play. Watch your dog figure out how to be a puzzle master! REAL WOOD LOOK: The Nina Ottosson Dog Worker is made to look like real wood, but its unique composite material has all the benefits of both wood and plastic and is more durable than wood and easy to clean. CHALLENGING FUN: Elevated play pieces in this Dog Worker help dogs retrieve treats and move pieces while keeping them entertained and engaged with no interference to fun! Nina Ottosson Dog Games and puzzles are great for dogs of all ages, breeds and sizes. This level 3 dog game is especially recommended for more challenging play, but can be used with dogs of all play levels. NO REMOVABLE PARTS: This dog game has built in play pieces that don’t come out when your dog plays with it. Durable construction also helps to keep this dog toy intact, making it your new go-to dog game time after time. LEVEL 3 CHALLENGE: A bit more challenging than Level 2 Nina Ottosson dog games and dog training puzzles, the Dog Worker helps to challenge your dog in new ways, while presenting them with tasty treat rewards with each discovery! If your dog has mastered introductory puzzles, Level 3 games are a smart choice!