I've moved your thread to the breeding/breeders section.
A couple of things. First, just wanted to say that it can take longer than a week for breeders to respond. Keep in mind that they have dogs to take care of, real jobs, lives...give them some time to respond. I recommend following up with a phone call after a few weeks if you still haven't heard back. Some breeders simply aren't good at email, either. They may get such a huge volume of email that they may accidentally overlook an email, too. One breeder I know of right now is literally getting 20 inquiries a day (and that's on top of all the other email people get in a regular day...that's a lot!). If you are really interested it's worth a follow up call to say you're really interested in chatting with them at their convenience.
Another good place to look for breeders to contact is the Doberman Pinscher Club of Canada: https://dpcc.ca/
They have a breeder referral.