A search and rescue dog in the central Italian village of Amatrice looks for victims of a powerful earthquake that rocked the region on August 24, 2016.
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A UK Border Force detector dog helps check for illegal drugs in luggage arriving at Gatwick Airport on May 28, 2014 in London.
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A beagle trained to sniff out bedbugs inspects a bed in an infested apartment on April 30, 2009, in San Francisco.
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A member of the Japan Rescue Dog Association and his dog search for victims of an earthquake and tsunami in northern Japan on April 9, 2011.
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An avalanche rescue dog searches for a person buried in the snow during training on January 17, 2013, near Alpspitze mountain in southern Germany.
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A member of the Los Angeles County Fire Department guides his search dog through a collapsed building on April 30, 2015 in Kathmandu, Nepal.
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An airport policeman and his sniffing dog inspect a passenger's luggage at the airport in Manila on September 1, 2014.
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A bedbug-detecting dog signals which container has live bedbugs at the BedBug University North American Summit on September 22, 2010, in Rosemont, Illinois.
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A bomb-sniffing dog and his handler from the Salt Lake City Airport Police check bags at Salt Lake City International Airport on December 12, 2001.