Ok guys, here's what I am looking at, I need a big dog, fairly protective and loyal. I have a house that am waiting to be finished on 1/2 acre so the yard is not an issue. I work late and my lil sister is gonna be living with me (she's 17) and I don't want her there by herself. I'm looking at these breeds, rottweilers, bullmastiff, english bulldog, german shepard, south african mastiff...Any of you guys owned these breeds? Any suggestions? I don't like pittbulls