It’s not safe to assume that your dog would never bite anyone.  It may be unlikely, but just about any dog will react aggressively if somehow it does feel threatened. Also, you may not know what your dog is like when you are not there.

Years ago I had one of the most social, lovable dogs in the world, a dog who I thought was a terrible watchdog. Once when I was home alone he looked out the window and growled softly but he didn’t bark. For an hour. What ever he was looking at, at the time I truly wanted him to bark! But he was everybody’s friend, not a protector type of guy.  Or so I thought.  Then one day a friend told me that he had come by to drop off a forgotten jacket as a favor. He told me that, finding I wasn’t home, he opened up the front door of my little cabin to reach inside and toss the jacket onto a chair, but “Alako nearly took my arm off!” I was shocked to hear this. My friend wasn’t actually hurt, just scared by my dog, but I could hardly imagine Alako being so protective! The experience taught me how little I knew.

It’s just a natural thing for a dog to protect his or her territory.  The safest thing is to assume that your dog would bite an intruder and go from there.