RPY Pet Smarter Interactive IQ Treat Dog Ball Dog Toy Sounded Dog Feed Ball Perfect for stimulating small dogs' IQ and sensitivity Play the ball, it will make a sound to attract dogs' attention and interest Made of high quality non-toxic plastic, environmently friendly and will not harm to the heath Add some appropriate food into the ball, good for training your dogs Sizes (Diameter): S-2.56"; M-3.54"; L-4.33"