Elvis the Robo-Cat is a housecat who lost the use of his rear legs in a traffic accident. His owner, an amateur roboticist, has built him a motorized platform that Elvis controls by means of his front paws in order to move around the house.
(Thanks, J Tony!)
Update: As many have pointed out, this is a Comedy Central humor piece and not real at all. Here is a direct link to the video, too. (Thanks, By the Grace of God, Remy, Roger, Sean and Andrew)