Diggs Groov is a first-of-its-kind crate training tool that helps pups love their crates. Whether you are introducing your puppy to a crate for the first time, re-training an older dog, or just giving your pooch a special treat to enjoy safely in the crate, Groov makes crating easier and more enjoyable for everyone. Groov is made from high-quality, food-grade, BPA-free all-natural rubber, and is ergonomic and durable. Best of all, Groov is easy to use and is compatible with Revol and most traditional wire crates. Patent Pending