http://www.faiththedog.net/video.asp
This page has a link to a video clip from the Montel Williams show about a dog with only two legs who has been trained to walk upright like a human.
It may take a while to download- it is BIG (5.61mb) - but it is an amazing story!
You have to go to the bottom of the page and download the video, (there are instructions) you can't view it online.