Walking on two legs seems to come much more easily to some dogs than to others. I have had one dog (out of a lot) that was very good at it and all it took to get her started was to hold a piece of hot dog high enoug that she had to stand up to get it. She would stay up for quite awhile walking after it.Paul that is amazing, I wish one of my over bred over fed Shepherds could do that, that took some excellent training, very cool.