Fantastic Dog. I have shepards. No one comes in. I leave the doors un;locked most of the time.
We were robbed once a year ago when no-one except the Chow Chow was home.
There was no blood (middle of winter) but all the robber took was one pillowcase and a couple of minor items.
I would imagine it all took place in less than a minute...the chows don’t bark before they bite...