Level 2 brightly colored, interactive dog puzzle that's designed to keep dogs engaged and satisfied while preventing any destructive behavior due to boredom. NINA OTTOSSON additional removable parts and is easy to hand wash with soap and water.can be filled either through the top opening or through the side with treats and snacks your dog adores. Shake the dog toy to release the familiar scent of your pup's favorite treats, and place on the ground before letting your pup take a spin!