I've done the first steps of teaching Marsh to do a handstand. He'll look for things to put his back feet on (this looks -really- funny when there's nothing there), and it would be pretty straightforward to get him on a wall and wean off the wall. He's about 40 pounds though. I'm concerned he's too big for the trick. I've only seen toy or small terriers doing the trick. What do you think about larger dogs doing this trick?