
It's a difficult one where faults are concerned, as most failings are not a matter of simple inheritance and anyone pointing out such may be seen as trying to ruin a dos or breeders reputation.
Most breed clubs have health committees so health info is gathered, what form this takes varies, some of it may be general so that people are willing to report in confidence, so good for a general view of a problems occurrence, but not that good for specifics. Other clubs publish full details, which may cause some people to be unwilling to disclose.
This is where the old yearbooks can be so useful you may notice that particularly nice dogs lines are suddenly dropped, a little digging may turn up a health issue associated with that dog or lien. If your considering line-breeding on said dog or lien it may give you pause or get you trying to find out more from owners or breders of said dogs or those that used them, but bewre of sour grapes or shifting blame.
Discretion is a prerequisite so that people feel they can be honest without you stirring trouble for them, such is human nature sadly.
Barbara and the Grey Curly Tails.