This isn't the first video for Duncan Lou Who the boxer. His story is that he was born with severely deformed back legs, but he was saved from the scrap heap by the Panda Paws Rescue organization. They worked with him, including fitting him with a doggie wheelchair to carry the weight of his hindquarters and provide mobility.
But Duncan Lou Who had different ideas. He didn't like that wheelchair, and eventually he learned to get around - and get around very well - without it.
Here is Duncan Lou Who and his doggie pal Socks having a tug of war:
Here is Duncan Lou Who fighting his way up stairs:
And here's the video where we were first introduced to the two-legged boxer named Duncan Lou Who: