I was able to park and photograph these three young Coyotes playing in a plowed field at the Sequoyah National Wildlife Refuge in Oklahoma. This went on for over 30 minutes. They got a little rough a few times.
Unlike wolf pups, coyote pups begin seriously fighting (as opposed to play fighting) prior to engaging in play behavior. A common play behavior includes the coyote "hip-slam". By three weeks of age, coyote pups bite each other with less inhibition than wolf pups. By the age of four to five weeks, pups have established dominance hierarchies, and are by then more likely to play rather than fight. (Source Wikipedia)
Here are more photographs of the Coyotes at the Sequoyah National Wildlife Refuge:
Coyotes Playing - Sequoyah National Wildlife Refuge - Oklahoma