I have heard that certain dogs such as German Shepherds, may have developed an inborn fear/aggressive attitude toward black people through generations and generations of police work. That sound so terrible and now I feel like a racist (IM NOT!!!). I also read/heard(?) that dogs often have a hard time seeing the dark colors and are often "startled" by black men or women approaching. To them it seems like they are "sneaking up" since they can't see them very well until they are right there.