The Nina Ottosson by Outward Hound Puppy Tornado Interactive Treat Puzzle Dog Toy is an engaging dog puzzle that provides a fun physical and mental challenge for your pet. Made from food safe materials that you can trust, it is easy to wash by hand with mild soap and warm water. The toy has 12 hidden compartments and 3 dog bone covers, so you can vary the difficulty level to keep your furry friend entertained.