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Erick Robertson, of Oakhurst, Calif., pets Porkchop, a one-year-old search and rescue dog as he receives a dehydration intravenous treatment, Wednesday, Sept. 19, 2001, at the Society for the Prevention of Cruelty to Animals mobile clinic just outside ground zero in New York. Robertson and Porkchop have been working at the World Trade Center attack site since Sunday. (AP Photo/Suzanne Plunkett)

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.