Hi Chas, welcome to the forum, and congratulations on your new addition. I hope that the pain of losing your life long pet will be eased by his doodle ways.
I find myself in a very difficult position, I honestly did not want to respond to your post because I don't want to sound like I am preaching or even disapproving of your purchase. In fact, I am so grateful that you found this pup and gave him a loving home...but...I feel that this needs to be said, for all of those people reading the forums and trying to decide what to do...
I doubt you will ever find the breeder. Your pup was, most likely, the product of a puppy mill or a back yard breeder. The "breeder" (and I use that term loosly) sold your pup to a puppy broker, probably at a very young age, and your pup was shipped from its home in conditions that you would not want to know about...these pups are then placed in pet stores, cleaned up and put in windows to attract loving people like yourself. But when the pup ages and becomes unsaleable...and well, many are killed because they were not cute any more.
These breeders have no business license, no business entity. They don't care about their dogs or their puppies, they are only trying to find the cheapest way to earn a few bucks so they breed their dogs, literally, to death.
If you find your breeder...I will be very, very sruprised...but also if you do, don't expect to find a sweet, loving home environmet. In fact...I don't think you really would want to know.
Just love your pup with all of your heart and you can make up for what has probalby been a horrific first few months.
I am sincerely glad that you have ths pup, and that you and the pup are so happy together. It is a hopeful and happy ending.
Please continue to post here, because everyone is supportive of YOU...it's just that you probably can't find much help in locating the lineage of your pup.