The ball can be filled with small treats in various sizes. The opening is adjustable to suite the size of the treats. With this ball, especially animals who are kept alone can be kept busy for a relatively long time without requiring attention from the owner. However, every pet owner should remember that a toy is no replacement for a loving, petting hand. Note: Make sure that the ball itself is not being chewed on. If this is the case, the ball should be removed because swallowing pieces of plastic can lead to intestinal obstruction! Colour may differ from photo.