Ready; set; fetch The Chuckit ® Whistler® keeps the game of fetch interesting and challenging for dogs. Four holes in this natural high-bouncing rubber ball produce a whistle as it soars through the air to keep dogs interested and focused. The gripable rubber ball is made just the right size to use with any Medium Chuckit Launcher. Ideal for outdoor use, the durable rubber surface withstands tough play and is resistant to dirt and slobber for convenient cleaning.WHISTLES WHEN THROWN: Chuckit 's whistling ball is designed with four sound holes that create a whistling sound in the air, making fetch more exciting for dogsHEALTHY PLAY: For stimulating playtime that helps pets stay fit, the Chuckit whistle ball encourages pets to leap and chaseHIGH-BOUNCING BALL: Made from durable rubber, The Whistler fetch balls for dogs are designed to bounce higher and farther than standard tennis ballsCHUCKIT LAUNCHER COMPATIBLE: To make fetch even more exciting for pets, this Whistler Chuckit ball fits any Medium Chuckit Ball Launchers; dog ball launchers available for purchase separatelyDURABLE DESIGN: To hold up to rough play, the Chuckit Whistler is made of rugged, long-lasting rubberEASY TO CLEAN: The smooth, rubber surface of the Whistler Chuckit ball resists mess and allows pet parents to easily wash off dirt or slobber