** FILE ** Erick Robertson of Oakhurst, Calif., pets Porkchop, a one-year-old search and rescue dog, as he receives fluids intravenously to treat dehydration at the Society for the Prevention of Cruelty to Animals mobile clinic near the site of the World Trade Center attacks in New York in this Sept. 19, 2001 file photo. Scientists have spent years studying the health of search and rescue dogs that nosed through the debris at ground zero, and to their surprise, they have found no sign of major illness in the animals. (AP Photo/Suzanne Plunkett, File)

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