Let your dog choose which ball to fetch with our Chuckit!? Fetch Medley. This 3-pack of fetch balls comes with a small Max Glow?, Erratic, and Whistler? Balls. For nighttime play, the Max Glow Ball glows bright making it easy for your dog to find. The Erratic Ball features a unique shape that makes the ball bounce in an erratic path, giving your dog something exciting to chase. The Whistler whistles as it's thrown in the air, keeping your dog engaged in play. Ideal for small dogs. Each small size ball compatible with our small Chuckit! Launchers.