Beautiful male dog.  He is one of our family and used for security (without any specialized security training as yet).  I have used him to confront a man who was on our property without any incident.  That same man was arrested 2 days later for trying to steal a vehicle down the road and pulling a 3 foot sword on the owner of the vehicle.  I believe the only reason that man didn't come at me is that I had Duke by my side.