This section is from the book "The Book Of Dogs - An Intimate Study Of Mankind's Best Friend", by Ernest Harold Baynes, Louis Agassiz Fuertes . Also available from Amazon: The Book of Dogs: An Intimate Study of Mankind's Best Friend.
Many types of shepherd dogs have been developed in Europe, and doubtless a good many have just "growed," like Topsy. But it is not likely that the Belgian dog is of the latter class, for in common with several other Belgian varieties he has arrived at a very concise standard, and has proved in the present war one of the most dependable and valuable of dogs for the purposes of finding and bringing aid to the wounded in No Man's Land, as well as carrying messages where a man could not go and live.

Police Dog, Belgian Shepherd.
He is a trifle smaller than the better known and more extensively advertised German shepherd, or "police," dog, and is usually solid black in color. He is also a bit stockier and less rangy in build and has a little more width of brow. While not so strong as his big, light-colored German congener, nor so formidable as an antagonist, he is equally intelligent and capable, equally keen of scent and sight, and probably less of a responsibility for his owner.
 
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