Amazing Dog Walks on Ball

I have no idea how this trick came to be, but I do know this dog has better balance than me! (I sit on one of these balls at my desk at work every day -- but that's sitting, and I have to admit I've almost rolled off a few times by accident.)

At first I wondered why he was even on the ball, but keep watching... he jumps up there all by himself. He must love being the star of the sidewalk!