This pet toys adopt a unique 3-layer rotating layer design, and contains 3 dog bone-shape covers. Which is different from the ordinary single-layer design, and not only can hold more food, but you can also adjust the difficulty to creat barriers according to reaction of your dog. By setting up obstacles for dogs to find food or treats with our dog enrichment toys, you can effectively train your dog's sense of smell, and exercising your dog's thinking and decision-making ability. While improving intelligence, it really makes learning for your dog fun and easy. With your pet's health in mind, Our dog puzzle is made of non-toxic, BPA, PVC and phthalate free food grade material. Safe and environmentally friendly while ensuring robustness. And, before the first use and after each use, you just need to wash it with water and let it dry. This treat dispensing dog toys encourage dogs to eat slowly, slow down the feeding time, which can help decrease their bloat and prevent throw up, and help your dog develop healthy eating habits. At the same time, enough to attract the attention of the dog, help dogs relieve stress, keep alive.