The GoughNuts Black Ball 50 was designed for safe play so you would feel good about your dog's toy. To keep your dog safe if a blockage situation was to occur, the axis groove system allows for oxygen flow to your dog's lungs. Before purchasing, please make sure the ball (3" in diameter) is large enough for your dog's mouth so that it is not a choking hazard. It is not recommended this ball be used as a chew toy. Please note that the ball doesn't float and in order to keep both you and your dog safe we recommend you do not play close to water.