Any dog that is half smart (and, Dobermans tend to be 100% smart!) will realize that in order to be rewarded for stopping barking, it is necessary to first start barking. Just sayin'...You could try the technique at rewarding quiet behaviour. Once barking, you wait for her to stop and say 'quiet' and treat immediately. You just need to make sure she has been quiet for a few seconds, so it’s clear you're rewarding the quiet behaviour (instead of the barking). When she starts barking again and then stops, you say 'quiet' again, and then gradually lengthen the time before treating.
It takes a lot of patience, but does work! Good luck
I dont know if I've upset you or something, as you seem to nit-pick at almost every advice post I make? I dont claim to be an expert, I purely state methods which have worked for me. Rewarding a dog for being quiet does not make it bark more, and the OP didnt state that she doesn’t want the dog to bark at all. She stated the dog barks too much, and she want to be able to stop the dog barking on command.Any dog that is half smart (and, Dobermans tend to be 100% smart!) will realize that in order to be rewarded for stopping barking, it is necessary to first start barking. Just sayin'...
I would rather ask for an incompatable behavior (sit with attention is good) or banish the dog briefly or use a verbal correction or something. I do check when a dog is barking, and thank them for alerting me to whatever is out there (that is their job!), but then I make it clear that they are done once I am alerted.
The thing it i am scare to punish her by putting her in his crate. It was a hard time for her to be confortable in her crate.My first male after getting almost attacked would flip seeing dogs walking by, barking excessively and trashing the window blinds. When he was braindead to the quiet command, I would give him a timeout in the crate. Eventually he got it and would give a bark or two, I would say yeah its a dog. If he went on I would point at the crate, he would settle, cuz the next incident he would be in the crate. Being consistent is key.
Once he catches on, then get a stranger friend come by(who never met him, nor will they visit) and beat on the door and then allow it.
Cuz now you defined their job.