uh, not necessarily. German shepherd and Doberman fit the bill for both. As does Rottweiler to an extent, were not talking marathon running over here more like a mile.
What are you talking about? Bullmastiffs are notoriously stubborn and one of the most difficult breeds to train. You compare them to mastiffs but they are only half, the stubbornness comes from the bully side.
neat that's why I don't take mine running
Don't want a lab they aren't much of a guard breed, I want my family and property protected when I'm away