arson dog
 n.— «Their job is accelerant-detection canine, better known as an arson dog. The Labrador retrievers are trained to sniff out accelerants such as gasoline, kerosene or lighter fluid at a scene when arson is suspected.» —“Sniffing out a fire culprit” by Steve Stein Journal Star (Peoria, Illinois) June 4, 2008. (source: Double-Tongued Dictionary)

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