At 12:30 a.m. on 9/11, Roselle whimpered at Michael Hingson's bedside. When the trained guide dog was "on the clock," nothing could faze her. But without her harness she was free to be scared of the coming thunderstorm. The two had a busy day of meetings and an important presentation ahead. A normal day. Until they went to the office. In Thunder Dog, follow Michael and Roselle as their lives are changed forever by two explosions and 1,463 stairs.