Everyone in a great while we have a litter that will have a large puppy that we know will be bigger than the standard. I would not have any problem keeping someone in mind and let them know when one of these are born.
I believe if you search for a nice breeder, and explain your situation you will find more than one great breeder willing to work with you and let you know when one of these special heavy duty babies arrive.
We recently had a "chunky bit" of a boy born, he is gorgeous, cute as it can be, i have no idea how big he will be exactly based on the weights of the parents as he was born heavy, loves to eat and it is probably one if not the biggest baby we ever had. I found someone like you , who was looking for a heavier puppy .
Look for a great breeder. that is the best way to start. Local to your area so you can check them out it is always the better.
Good luck/
XOXO
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