I know very little about dogs, which is why I haven't posted before, but I wanted to let you know that you're not the only one to have been screwed over by disreputable breeders - just that in our case it was a cat.
My mum bought our kitten from an apparently reputable breeder, and in hindsight it was obvious from the get-go that he wasn't a normal kitten. I was 5 at the time, and he would spend hours curled up in my lap or in my arms. We thought it was so cute at the time, that our Button wanted to spend all his time with me, his little friend. But it was wrong that this scrap of a kitten wasn't playing and pouncing and climbing sometimes too.
When we picked him up, we asked for his pedigree and were told that that it was off with the breed association being registered - we found out afterwards that there's no such process and the breeder was clearly just fobbing us off.
Anyway, to cut a long story short, Button died in my arms three months later, in agony, his tiny body unable to suck down the air it needed because his lungs were saturated with fluid. It was my first taste of grief, I will never forget it, and I still cry now, aged 38, thinking about it. Button didn't deserve to live or die like that.
When the vet took a look he found my Button was riddled with internal congenital defects.
My mum contacted the breeder, who offered us another kitten. We said no, but demanded and demanded and demanded Button's pedigree. When it eventually came, there were only 4 different cats on the whole sodding thing - all were champions, all were related to each other. Poor Button was so interbred that he never stood a chance.
We've since had many, many delightful and healthy pedigree cats. Please don't let this awful, awful experience put you off other dogs in the future.
((((((OP))))))