When wanting to learn how to do something, one should always look towards a known expert:
http://lmgtfy.com/?q=dog+whisperer Mr. Millan has a website with several common issues. Excessive barking is one of them:
https://www.cesarsway.com/dog-behavior/ ... nd-howling
Dobermans are great dogs when well trained. Me, I'm more of a cat person. I love dogs, but they're too needy emotionally. I have a hard time dealing with the few other relations in my life, let alone a dog's need for attention. Cats need only a little attention in comparison.
Also, think we had a pet thread at one point for this kind of stuff... share pictures, problems, etc. Be nice if we had one again...

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