[Challenging Educational Dog Toy]: Level 4 dog food puzzle is perfect for pup who has mastered levels 1-3 and are ready to learn the successive steps. Great for redirecting destructive or negative behaviors in a fun and exciting way! [Squeaky Dog Toys]: This dog interactive toys is designed with a sounding device in the middle of the toy,which is to attract the pet's attention.Also,you would enjoy the fun of dog treat puzzle toy with your pets, greatly improve relations with your pets and get fun during interactive dog games. [Non-removable Parts Dog Puzzle]: For the protection of the dog's safety,built-in parts of our dog toys are designed to be non-removable, which is to prevent the removable parts from being accidentally eaten by the dog when using the game. [Food-Safe PP Material&Anti-Slip]: This dog treat puzzle is made with toxic-free PP materials, very durable for pets long time playing.The bottom four corners are equipped with four non-slip pads, which can well fix the game toys on the floor.