Witness: Witness Archive 2017

After the 9/11 attacks, a New York guide dog called Roselle was hailed as a hero for helping her owner safely down 78 flights of stairs and away from the Twin Towers before they collapsed. Simon Watts talks to Roselle's owner, Michael Hingson. PHOTO: Roselle and Michael Hingson, right, meeting a 9/11 rescue team (Getty Images)