9/11 rescue dogs

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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)
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Rescue dog
A group of rescue workers with dogs leave the "ground zero" site of the World Trade Center in New York City, September 29, 2001. (REUTERS/Jeff Christensen)
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New York Police K-9 officer Peter Davis and his Search and Rescue dog, Apollo, attend the New York Specialty Dog Show February 9, 2002 in New York City. Officer Davis and Apollo were the first Search and Rescue dog crew on site after the collapse of the World Trade Center September 11, 2001 in New York. Officer Davis and Apollo received the Langden Sarter award from the American Kenel Club (AKC). A check for $400,000 was given from the AKC to the Federal Emergency Management Agency (FEMA) for studies on the health affects of exposure to the site on dogs like Apollo. (Photo by George Best/Getty Images)
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World Trade Center Search and Rescue dog, Apollo, attends the New York Specialty Dog Show February 9, 2002 in New York City. Apollo was the first Search and Rescue dog on site after the collapse of the World Trade Center September 11, 2001 in New York. Apollo and his handler, New York Police K-9 officer Peter Davis, received the Langden Sarter award from the American Kenel Club (AKC). A check for $400,000 was given from the AKC to the Federal Emergency Management Agency (FEMA) for studies on the health affects of exposure to the World Trade Center site on dogs like Apollo. (Photo by George Best/Getty Images)
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Debra Tosch, executive director of the Search Dog Foundation, and her partner Abby searching at Ground Zero
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Students watch as firefighter Marc Valentine plays tug-of-war with his dog, Val, a search dog trained by the National Disaster Search Dog Foundation and deployed to seek survivors in the September 11, 2001 World Trade Center terror attack, during a demonstration at San Rafael Elementary School on September 10, 2002 in Pasadena, California. One third of the dogs trained by the NDSDF worked at 'Ground Zero' in New York city. (Photo by David McNew/Getty Images)
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Guide dog Roselle yawns as its owner Michael Hingson speaks at the North Shore Animal League Americas Lewyt Humane Awards Luncheon January 9, 2002 in Garden City, NY. Roselle received an award for leading Hingson down 78 floors from the World Trade Center on September 11. (Photo by Spencer Platt/Getty Images)
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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)
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Cowboy, a black-and-white Border Collie searches for victims in the rubble of the New York's World Trade Center for the Federal Emergency Management Agency, in this Sept. 21, 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/Alan Diaz, File)
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Abby, a black Labrador trained to lead rescue teams to trapped victims in disaster areas, including the wreckage of the World Trade Center.
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Search dog Abby engages in a tug-of-war
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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)
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Scott Shields, right, gives his rescue dog "Bear" water from a bottle after coming out the World Trade Center disaster site in this Sept. 13, 2001 file photo. The North Shore Animal League America has offered to pay medical bills and provide lifetime care for Bear, the famous search dog that suffers from ailments his owner says were incurred during recovery work at the World Trade Center site. (AP Photo/Beth A. Keiser, FILE )
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Labrador puppies "Hoey" (L) and "Hatton", named in honor of September 11, 2001 attack victims Patrick Hoey and Lenny Hatton who died in the World Trade Center, are pictured on the grounds of the Pentagon near Washington, June 28, 2011. The dogs are part of the Transportation and Security Administration (TSA)'s Puppy Program where young dogs are raised to be used as future bomb sniffers at air cargo facilities nationwide. The tenth anniversary of the September 11, 2001 attacks will be commemorated this year. (REUTERS/Jason Reed)
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A photographer takes a picture of a sleeping labrador puppy "Hoey", named in honor of September 11, 2001 attack victim Patrick Hoey who died in the World Trade Center, in this picture taken on the grounds of the Pentagon near Washington, June 28, 2011. Hoey is part of the Transportation and Security Administration (TSA)'s Puppy Program where young dogs are raised to be used as future bomb sniffers at air cargo facilities nationwide. The tenth anniversary of the September 11, 2001 attacks will be commemorated this year. (REUTERS/Jason Reed)
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Rescue dog
A rescue dog is transported out of the debris of the World Trade Center, September 15, 2001. (REUTERS/HO/U.S. Navy Photo by Journalist 1st Class Preston Keres)
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Rescue dog
A canine officer and his dog take a much needed rest September 18, 2001 after search duty at the World Trade Center site. (REUTERS/Pool/Ryan Remiorz)

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