Andaka: It is something that is popping up in the USA show lines. I do not know extensive details because Boomer is only part of the study (and one of the first documented dogs). I'm not actually doing anything other than submitting samples and information, and occasionally getting updates. There is still many years of work to know the root cause and possibly develop a genetic test. The only thing they know thus far is it is showing up in GSDs: reputable breeders, BYBs, and puppy-mills. It has yet to show up in working lines. The challenge of this study is most breeders ad rescues would have these pups humanly euthanized as soon as their deformities become apparent as their future quality of life would be questionable.
carmspack: Thank you, I will keep looking into it. Perhaps he just prefers working homes, and got the impression mine would not be. The questionable dogs are certified police dogs, and comments on behaviour from a person who used to work with them and who's opinion on dogs I value. I don't want to go into any details for confidentiality reasons.