The Nina Ottosson by Outward Hound Dog Smart interactive dog puzzle is a fun way to get your dog excited about problem solving games! This level 1 dog puzzle toy features nine treat hiding compartments that can be filled with your pup's favorite treats and covered with nine dog bones that release the tasty scent of treats through the top hole. Place on the ground and watch your dog use his noggin as he paws, and nudges the bones over to uncover the hidden rewards! You can also vary the level of difficulty by placing the bones flat or tilting them up at an angle over the hidden compartments. Made from food safe composite materials that are BPA, PVC, and phthalate-free. Cleans easily with warm water and mild soap.