Planet Dog Whistle Ball - Durable Dog Training Ball with Built-in Whistle for Outdoor Play, Fetch & Obedience Training - Perfect for Beach, Park & Backyard Fun

Whistliiiiiiiiiiiiiing is this balls strong point. If you remember the Nerf Whistle Ball of yesteryear, then you'll love this ball. Made from the super tough Orbee material that Planet Dog is known for, the entire ball is squishy, including the whistlers. Since it's the same size as a tennis ball, you'll be whistling in joy as you throw it around or use it in a ball launcher.