Gent police officer in night service uniform with Bouvier type police dog in front of kennel building. Photo circca 1900.

This photo is from what is generally regarded as the first formal police canine program, in Gent, Belgium in 1899, under the direction of Chief Commissioner Earnest van Wesemael.

This was twenty years before the Bouvier became a formal breed, but this dog certainly has the Bouvier type and expression.