The reason you shouldn’t buy a sport dog over a family protection dog is because sport dogs aren’t trained in real life situations. They are trained in a field in a marshmallow puffy suit. The guy breaking into your home will not be in a field or wearing a marshmallow suit. These dogs do the same drills everyday in order to perfect these same drills for a perfect score. These dogs have no interest in biting or going after a person or even understand the fundamentals of what a threat is.