Only that (upon talking to LS expert vets) the gene could be...and I say "could"...theory...be mutating and that some dogs are learnign to live with it for longer and not showing signs. So people who say they have never had a dog with it...may never know that there are puppies they sold who have it. When I say that my dog had NO signs...you should see him. He is an athetic top shape dog. The breed also may be learning to live with it. My dog has the external multiple (not internal MVD). Again...some theories...mutatiion of gene?? The dr said she has one on her property that is just like mine. looks as health as a horse. Hers she things is missing that main vein...what is it called again???? I am blanking on my terminology. It could be that mine is missing that vein and that is how the multiples happened. Liver biopsy came back clean.
Another helpful resource are the breeders on http://tsfannymaelivershuntfund.homestead.com/. There are some breeders there who have been studying it and pedigrees and can help breeders "try" and prevent it but there is only so much you can do. They are big on bile acid testing puppies before they are sold so at least the owners do not get attached to the dog.

Yes, there are some GREAT show breeders out there being honest. Absolutely I agree with you. There are a few show breeders who are not being honest and not being nice about this and it buries the problem and hurts GOOD show breeders because they may be buying puppies to breed and not knowing the whole truth. Just like anything...a few bad apples can ruin a bunch of good apples. My only point is to say...just because you spend $1000, $2,000, $3,000 on a dog and he has TOP champions doesn't mean he can't get LS. You have to bile acid test before using him to see if he does or doesn't. Either the breeder is not a good breeder and is so worried aobut winning he/she isn't being honest OR the breeder IS a good breeder and it CAN happen to anyone. I met a show breeder who bought a dog from a very well known show breeder and was going to use a stud dog from this well known one...tested the dog...woudln't you believe his bile acids came back very high?? Many other breeders had used him for stud already (from my understanding of the story)
She returned the stud dog saying she could use him and why.

It seems that until a genetic test is available, the only thing we can do is BAT the puppies going foward. At least then we won't be selling, finishing or breeding them.