Never hit your Bulldog to redirect them. Not only is it ineffective, but confusing and harmful to your dog. If they need to be redirected quickly, lightly touch the side of their neck and make t sound by putting your tounge on the roof of your mouth and blowing. This will serve as a warning to your dog (similar to the way dogs warn one another in packs) and should stop their behavior.
Bulldog - Dog Lover
Bulldog - Dog Lover