In my 35 years raising and Dobermanns, experience has shown it is almost always the human in the wrong.
I am interested in seeing how bad the wounds are from the "attack".
There is a difference between simply being bitten and a full on attack.
BTW - We have a small Doberman (65 lbs) who is (Like most Dobies) very sweet and well behaved. We laugh when people walk across the street when they see us coming with her.