Dobermanns are relatively quiet dogs.
In 40 years, I have *never* had one of mine bark unless there was something to bark about.
Perfect guards, IMO.
Anyone found outside the “perimeter” gets a warning bark.
Anyone found *inside* gets no warning at all.
I worked Census in 1990. I had a long form for a brand new house in an upscale brand new sub pretty far from town. No one would answer the door but someone was obviously home. There was a high board fence around the back yard. On the third attempt I finally went to the gate. There was a pool in the back with a middle aged man and a young woman in it unclad. There was a Doberman lying at attention at the end of the pool, I walked over, showing my bad with Census on it and the woman started shrieking. He told her to shut up and asked me what I wanted, I told him. He said let’s get it done and answered all the questions. As I turned to leave he said to walk evenly and steadily to the gate and close and latch it. Dobie was alert and quivering. The woman was yelling again about that $3000 dog that was worthless. I went out and closed the gate just as the dog hit it. The fence quivered and it sounded like a board cracked but I had got it latched. The man was a local businessman whose address was in town where he had a middle aged wife and several teenagers.