Glow in the Dark Dogs Ball. Glowing rubber ball for dogs keeps the game going even after the sun goes down. Your dog will love its bouncy, grip-able texture and you will love how easy to clean this Max Glow Dog Ball is. 5 minutes under any bright light generates 20 to 30 minutes of glowing playtime, no batteries or cords needed. Made with safe photoluminescent material. Compatible with all large Chuckit Launchers. Measures 3 inches in diameter and is best suited for dogs weighing 60 to 100 pounds. Dog balls should be small enough for your dog to carry, but large enough that the ball can't completely fit in their mouth. When in doubt, buy a size up