What about the breeder that doesn't tell? It is a double edged sword, I bred one of my bitches, did the research, looked at the genetic testing and asked all the right questions to the stud dog owner..............AFTER my bitch had been bred by one week, I was informed by another breeder about the PPL that was being produced from that line. When I confronted the stud's owner, she was pissed, wanting to know WHO told me. Of course not concerned about the fact that she should have told me BEFORE I bred to him.
Now here is the kicker, I placed all the pups with spay/neuter contracts and didn't keep one, also in the contract I wanted the pups to be CERF'd every few years. I had a terrible time placing those pups because I was honest and told prospective puppy owners about the possible risk. Most walked away.........to purchase from another breeder that I KNOW didn't disclose what was in their lines because the pups were being placed as 'pets'.
6 yrs later all my pups are still CERF clear, which at least proves to me that my girl shouldn't be a carrier.
In my experience, I would rather purchase and deal with someone who is knowledgable, honest and doesn't claim to have clean lines, because clean lines just don't exist.
Sometimes as breeder, we have to make educated and well researched gambles and there is nothing wrong with that is very thing is kept open and honest. And yes a good breeder will always try to lower that risk, but breeding is a gamble at the best of times.
Nothing is worse in my opinion than doing a breeding and knowing there MAY be a risk and keeping your mouth shut. And the fall out typically happens to the those who purchase the pet quality pups because they don't have the knowledge, the inside information and don't know pedigree's and line's, don't know where to seek the info and don't know if they are being lied to or not.