As long as nobody tries to hurt us, Sophie would never hurt anyone either. But strangers don't know that, and they often find themselves offering an explanation in the face of Sophie's gaze. "He can probably smell my dog on me," they say of her (it's hard for a lot of people to believe that Sophie is a boy dog, given her apparent ferocity. Another one is "I used to carry treats in my pocket..." At this point, Sophie skeptically backs off, having pointed out the threat, though she reserves the right to investigate further if necessary.
Perhaps this trait is common to dogs of her breed, as they annually win Europe’s Top Police Dog awards. These awards are usually given to the dog that has helped police seize make the most drug busts, and capture the most bad guys. Sophie, who is not a trained police dog, seems capable of doing most of that at first glance and without a second thought. It's not hard to imagine how efficiently a well-trained Belgian could do it. All I can say is that I am glad Sophie is on my side; I wouldn't want her coming after me.