Fostering a dog for a breeder

Recently, an acquaintance told me about her dog that she is fostering. I was curious because a) I love dogs and b) am curious always to learn about dogs.

She told me that she had wanted a gentle breed like a golden retriever since she has a child who is very rambunctious and she wanted to avoid any issues. She also didn't want a puppy to house train. She claims that she went to local rescue organizations trying to find an older dog to adopt but couldn't find one. I tried to stand there and accept what I was hearing, but found myself being judgmental. I mean, usually rescues are full of older dogs that no one wants, so it struck me as hard to believe. I tried to keep smiling and just listen and stop judging. Anyhow, she found a reputable breeder and liked the mother dog, named something pretty like Jolie. There were a litter of puppies up for adoption but she told the breeder that she wanted a young adult dog. He was surprised and claimed he didn't hear that often. He suggested his foster program. Essentially, she'd get a 2 year old dog who had been house trained and gotten all of her shots. The dog would then be in her foster care for a few years and she'd bring the dog back to get impregnated and then to have at least 3 litter of puppies. During that time, all vet bills would be paid by the breeder. After the third litter, the dog would be her full responsibility and she would officially adopt/own the dog. I'd never heard of this and found it very interesting.

But in my heart, I feel that it's sad to breed dogs when so many beautiful, loving dogs are in shelters around the area and country and so many are put-down in kill-shelters. It really bothers me. I have to step back and try to release some judgment and realize that sometimes people really do have issues that need a certain breed, like those highly allergic to dogs but who love dogs might need to purchase, say, a labradoodle from a breeder. It's a compromise. But I find it hard to believe that there wasn't a single young adult dog of golden retriever origin or mix in the entire rescue community of our area. Then again, this acquaintance is very busy working woman with a child at home. I guess Lucy was my first "furry baby" as I call her and I love her so much and she was a rescue. I just see that rescue dogs can be so wonderful that I don't understand the need for dog breeders. *sigh*