And that's the issue here; it takes having the right dog, with the right training, and still it's an individual who may react differently, depending on circumstances.
A dog who barks and looks impressive is good, but depending on actual biting behaviors will often turn into a real liability, when that dog bites the wrong person at the wrong time.
There's a big difference between a dog trained to attack on command, a very special animal with very specific training, and one who will retreat on command, and a dog who will react depending on circumstances.
And, as pack leaders, if a family member invites a person into the house, it's the dog's job to be polite to that person!
And the better socialized that dog is, the more likely it is to make good decisions in difficult situations, and look for direction from the owner/ pack leader.
Otherwise, unless you live on a deserted island, things won't go well.
Mary