The German Shepherd was developed from various sheepherding dogs. So you would expect sheepherding traits such as athleticism, a compulsion to chase things that move, and swift responsiveness to their human shepherd/master.
Why? Well, the Powers-That-Be say white is an unacceptable color because German Shepherds were developed to be herding and guard dogs. White dogs, they say, are too visible to make effective guard dogs. On the other hand, white dogs blend in too much with the sheep or snow instead of being clearly visible to the human shepherd.
However, shelter personnel can be over-zealous in labeling every medium- to large dog with a vaguely shepherd-ish look as a "German Shepherd cross." Be aware that a dog can look like a German Shepherd without having any Shepherd genes at all. 2b1af7f3a8