Flygirl, I'm surprised to hear that was their solution to your Doberman's confidence issues. My dog is incredibly self assured, bold, and highly confident, but he would rather walk all over another dog in the house than show him the ropes. Not that I would allow it - but that was a matter of management. He had to be taught that dogs in my house are my guests and allowed to the toys, beds, chews, water, and, most importantly, my attention.
Around other dogs, he tends to like things to go his way. Only child syndrome and all
He can easily live with another dog, but I take special care to remind him to behave around dogs with lower confidence (not allowing him to steal toys, even as an invitation to play, asking him to stay still and wait while another dog comes to me to cuddle, instead of letting him insert himself between us, etc.).
A highly confidant dog could be the best thing for Quinn, but it also may not turn out to be the ideal situation. There is a wide spectrum of temperaments and personality types among dogs, so seeking out a dog to help with your current one's issues isn't, in my opinion, a reliable solution. However, if you are looking into the breed and a second dog for other reasons as well (ex: to be your
companion, as an obedience or sporting dog, etc.), I'd like to send you a PM about some breeders in the area.