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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)

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.