** FILE ** Mary Flood leashes her black Labrador retriever search and rescue dog, Jake, near the World Trade Center in New York in this Sept. 22, 2001 file photo. Jake, who helped search the rubble following the Sept. 11 attacks and later worked in Mississippi following Hurricane Katrina, died Wednesday, July 25, 2007. The results of an autopsy on his cancer-riddled body are part of a University of Pennsylvania medical study of Sept. 11 search-and-rescue dogs. (AP Photo/Alan Diaz, File)