The Move

Nice (the dog) has what I call his "signature move". When someone approaches he will roll over on his back and twist around to scratch his own back.
This morning, after his walk, after two days of walking to build strength, he was about to make his move as Dave, the sign Guy, walked up. Nice began the twist with his shoulders but was too stiff to commit to the flop over onto his back. He instead straightened up and walked back to the door of the office, waited for me to open the door then walked into his padded pen.
He has me trained...