The beast - doberman etc always caged in the day. No interaction from guests. Ferocious human haters. They will roam the yards at night and generally patrol.
If the point of this dog is to attack humans, or if that is incidental and it's not trained to NOT do that, it should be destroyed. It's effectively a sentient weapon that will attack people.
There are trained guard dogs and watch dogs. Watch dogs alert people and guard dogs to intruders. Guard dogs warn off intruders and can be trained to attack if a resident is attacked. The latter is much more problematic and liable for lawsuits but what you described is a walking Wrongful Death lawsuit waiting to happen. Trespassing laws (in the US) don't allow lethal force. Even Castle Law usually requires an intruder to be offering violence.