That is the question. With it your dog will romp, fetch, wag, play, swim then shake, wag and romp again. Without it, well... your dog will not. Made from the coolest material on the planet. Translucent, bouncy, bouyant, curiously durable and peppermint scented. Dogs aren't fussy... If your color selection is unavailable, we will substitute with an in-stock color. For larger dogs. 4" diameter. U.S.A. made. Recyclable