This is Tumbles. He is a six-week-old terrier mix, and was born with only two legs. When he was two weeks old, Tumbles was taken to the Friends of the Shelter Dogs (FOSD) in Athens, Ohio, a nonprofit organisation that rescues and provides shelter for dogs in need. A couple saw a photo of Tumbles on FOSD’s Facebook page. They contacted the shelter with the idea of developing a bespoke wheelchair that would help him get around.