Miller, a Transit Police dog, watches commuters at Back Bay Station a day after two explosions in Boston

 
Miller, a Transit Police dog, watches commuters at Back Bay Station a day after two explosions in Boston
Miller, a Transit Police dog with the Massachusetts Transportation Authority Explosives Detection Unit, watches as commuters enter the subway system at Back Bay Station a day after two explosions near the finish line of the Boston Marathon in Boston, Massachusetts April 16, 2013. REUTERS/Jessica Rinaldi