My understanding is that all breeds of dogs communicate the same way, whether a GSD, poodle or bulldog. Extremes of breeding can make interpreting the nuances of canine language difficult, (brachy, posture, cropped ears, loose folds on face, lack of tail...) and so mistakes happen. Bit like us trying to understand someone in a balaclava, OK that may be a bit simplistic, however, that I think was the gist of it from my adolescent training classes. I guess if this has to lead to a previous negative experience with a bulldog, then this may in part account for the incident.