Talk to any dog trainer or security dog trainer and they will tell you that 95% of dogs will NOT protect their home or owner from attack by an intruder, no matter how much they bark, growl, snarl when someone walk by the fence line or knocks at the door.

Rinky, I get it that you were trying to incite some fresh blood into the water here and I agree with you that the environment the dog is in makes all the difference...just like kids. No single dog is born 'bad', something happens along the way that triggers a response.