Are your adult dogs house-trained?
Some breeds are hard to house-train and this can be a big problem. Your breeder should be frank with you in discussing any problems associated with the breed. The breeder should have extensive knowledge about the training shortcomings in the breed. No dog is perfect; expect a breeder to be honest in discussing the breed’s “flaws”.
Furthermore if the breeder says the adults are not house-trained you know to beat feet away from that breeder. That means the adults are never trained at all, not worked with, never in the house and it means the puppies are never in the house and the living space (mom needs to be with her babies and no one wants mom in the house going potty all over everything).
You can expect a mill-bred dog from a breeder that keeps her dogs in a kennel every second of their lives. And you can guarantee all the puppies are being raised in a secluded space like the kennel or basement or garage as well. It doesn't take that much time to house-train a new puppy. It only takes a few weeks to get the basics down and then a few months to be really solid. If a breeder isn't taking that kind of time with her new breeding stock then how can he/she know the breeding dogs well enough to ensure they're of appropriate breeding temperament?