I don"t have advice but to say please check on other dogs the breeder has sold . Ask for a referal list from them and call the folks and talk to them. I did that when I looked for Merlin While it helps it doen't nessacarly cover every thing Merlin was the first of the pups my breeder has raised that got cancer. 6 litters and he was the first. He was 7yrs old most of his litter are still alive and going strong only one other dead hit by a car .breeder really misjudged that owner when they came to purchase the dog.
Another good source is your local feed store ask them about folks who buy from them . Thats how I found my breeder she did more than I had on my list of what they do to raise pups.