Well, you make my very point. Dogs bred for animal aggression were not bred for human aggression, does it matter what kind of animal it attacks? You've got to think back to the days when they needed animals/dogs to do that work yet not be human aggresive. The ones who were human aggressive in the hunt were culled. You bring up mixed breeds which certainly can't be confused with purebred dogs because theres no telling whats in the ancestery. You make my point on another comment, that bird dog owners understand their charges better, the same goes for any "working dog" including pitbulls. A bird dog mix is no more a bird dog than a pitbull mix. I've been around thousands of bulldogs (pitbulls) and have seen for myself the genetic link of human aggression vs animal aggression. I owned dogs that would roll on their belly for a human yet fire up seeing another dog. Bottom line is the bulldog breed is miss-used by 99.9% of those who have them. Bulldogs really should not exist anymore because a real ones are fighting dogs and the fighting of dogs is illegal. The "pitbull" of today is really no such thing.