We have had Diesel for about two weeks now and he and Raji haven't stopped playing since he got here. They chase each other around the house and yard, they play tug-o-war with sticks and toys and they wrestle non-stop. One of Raji's favorite things to do while they are playing is to pin Diesel down on his back and bite his package, it really gets his attention. Diesel will be getting neutered soon to "fix" that (no pun intended).
If Raji and Diesel aren't playing together then they are usually resting or sleeping next to each other. I have never seen two dogs get along so well. They are best buds!