A dog park is a park for dogs to exercise and play off-leash in a controlled environment under the supervision of their owners. These parks have varying features, although they typically offer a 4' to 6' fence, separate double-gated entry and exit points, adequate drainage, benches for humans, shade for hot days, parking close to the site, water, tools to pick up and dispose of animal waste in covered trash cans, and regular maintenance and cleaning of the grounds. Dog parks may also offer wheel-chair access, a pond for swimming and a separate enclosure for small dogs.