Belgian Shepherds descend from herding dogs that were sorted into one breed in Belgium in 1891, with four coat varieties: the long black Groenendael (the AKC's Belgian Sheepdog), the long fawn Tervuren, the short fawn Malinois and the rough-coated Laekenois. Adults stand roughly 22 to 26 inches and weigh about 40 to 75 pounds, with a square, elegant build and upright ears.
They're intelligent, watchful and devoted, and that drive made them police, military and sport dogs. In SF, that points to a dog that does well with hills, training classes and a person who's home often, but may be wary of strangers on busy sidewalks. Coat matters too: the long-coated varieties shed heavily twice a year, and the short-coated Malinois still sheds.