Belgian Malinois

The Malinois is a medium-to-large breed of dog, sometimes classified as a variety of the Belgian Shepherd dog rather than as a separate breed. The name "Malinois" is derived from Malines, the French name for the breed's Flemish city of origin, Mechelen.
The breed is used as a working dog for tasks including detection of odors such as explosives, accelerants (for arson investigation), and narcotics; tracking humans for suspect apprehension in police work; and search and rescue missions. The U.S. Secret Service uses Belgian Malinois to guard the grounds of the White House.