If you have a dog who is an aggressive chewer, the PetSafe® Ultra Woofer is a durable toy that will keep him busy. Designed of tough nylon and rubber, this toy was created to be more durable and challenging than standard ring holding toys. The extra-wide ends of the Ultra Woofer protect a single ultra-thick rawhide treat ring which is 4 times thicker than most rings. The toy’s design makes it more difficult for dogs to get a grip on the rawhide and keeps them from being bored. It’s easy to clean and top-shelf dishwasher safe. Available in small, medium and large sizes. For dogs over 6 months old. PetSafe® brand is here to help you and your pet live happy together™.