Those dogs are all in how you raise them. If you beat them...then they will most likely attack or snap on anyone.
My friend had 2 rocks....they never locked their door haha. But the dogs were like any other dogs if they knew you or you were with the family. They played with you and all that. But the minute they didn't like what you did...you better watch out. The first time iwent over there, i went in the house first before the rest of the family. The two rocks were waiting at the door sitting there growling when i opened the front door. I closed the door and ran back outside in the blink of an eye