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Rescue dog

A Sept. 13, 2001, file photo of James Symington and his German shepherd, Trakr, searching through rubble at the World Trade Center tower collapse site in New York, on Sept. 13, 2001, days after the terrorist attacks. Trakr and his master, a retired Canadian police officer who now lives in Los Angeles, were among the first search and rescue teams to arrive at Ground Zero after the attacks. (AP Photo/Stephen Chernin)

9/11 rescue dogs

After the World Trade Center attacks, 13 Search Dog Foundation teams were deployed by the Federal Emergency Management Agency to help search for survivors.