I believe many will think "Oh, he looks a bit serious" but in the next second "Oh well, they can't have dogs running free that will attack humans anyway, so the dog is just showing off". If ppl then choose to approach the flock, even without evil intentions, and the dog attacks, then you can count on that the DOG will get all the blame. However, if people are looking for trouble and try to tease or provoke the flock...then it will be a different story