Chuckit! Whistler Ball Dog Toy - Medium, 2-Pack - Noisy Fetch Toy for DogsChuckit! The Whistler Ball Rubber Fetch Dog Toy Medium (2. 5 ) for Dogs 20 60 lb Assorted Colors Pack of 2 All of the Chuckit! balls are specifically designed for the most demanding use by a growing population of fetch enthusiasts. Each ball is compatible with the Chuckit! launchers so that you do not have to bend down and pick up a slobbery ball. Whistler Ball Designed for the most demanding use by a growing population of fetch enthusiasts this ball