Actually, if you go to the DPCA breeder referral page you'll find the breeders in Minnesota who adhere to the DPCA code of ethics: DPCA | The Doberman | Breeder Referral
There's also a decently sized show in Lake Elmo the weekend of August 26th, if you are able to make it to a show - that's always a great way to meet local people and their dogs, talk to them, see what you like in different dogs from breeders, etc.
I'm a member of the local Greater Twin Cities Doberman Pinscher Club - we'd be more than happy to help you out in looking for breeders. There are a few in North Dakota, at least one in Iowa, quite a few in Wisconsin and Illinois and Michigan if you want to stay "local-ish." Many people do travel for a pup, either taking a road trip or having a puppy flown in. I've done both - my boy is from Canada and my pup is from Texas. Sometimes the right puppy is not local.
Please feel free to PM me if you'd like - I'm more than happy to help you out!
Richter & Sypha
Glengate's Mountain Fortress CAA ORT L1V NW1 L1I L1E L1C NW2 L2V L2I ACT1 RATI WAC
& Sirai's Golden Masquerade ORT NW1 L1C L1V L1E NW2 RATI SOG WAC
“You cannot get through a single day without having an impact on the world around you.
What you do makes a difference, and you have to decide what kind of difference you want to make.”
― Jane Goodall