Yes, you want an LGD to at least bark if strange humans come by, but really what is it going to do when all criminals have guns and other weapons? I've also known some LGD's who are scary human aggressive, your life as you know it can end if a dog bites an innocent person. One female Sar, would sneak down the driveway to try to get at visitors while they were still in their car! A human aggressive dog, especially in North America is a lawsuit waiting to happen.