I didn't have a hard time learning this trick but we did it a little bit differently than newbear95. I already knew "dig" and I learned that by scratching at a post-it. So then mom transfered the post-it to her leg, then to her arm and then to her back. She told me to dig and then gradually changed the command to "scratch back"! Give it a try and then you too can be your mom's own personal back-scratcher - LOL!