IMO, you can't beat a good pure bred labrador retriever. FYI, we had a black lab named Remington from the time I was in the 8th grade until about 4 years ago. He was 13 or so when he died. He was big, square headed, and weighed about 110-120 pounds his whole life. He was very protective of the family. Scared off plenty of strangers who came to the door, especially salesmen. I disagree with your evaluation of their protectiveness but thats just my opinion based on growing up with him. When he died, part of me died with him.
"I actually don't know what a barrel shroud is, I think it's a shoulder thing that goes up."
Carolyn McCarthy (D-NY) Author HR:1022, when asked what a barrel shroud is and why it needs to be regulated.