To teach your dog to play dead, first give the DOWN command. Notice the side to which he is leaning. From this position, give the command of PLAY DEAD and gently push him over until he is lying on that side.
Offer verbal praise and a belly rub until he is comfortable in this position. Repeat the exercise until your pet rolls onto his side on his own. Follow with a small food treat.
Continue to practice this over and over.