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Originally Posted by Elle  Your opinion means nothing to me and hundreds of thousands of people that care about the history and future of the breed.
It's just your opinion to me because I don't want to buy a puppy. 
Here's more information on this parti dog. Yorkshire Terrier Club of America (Awards) |
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Originally Posted by gemy And just why wouldn't a registry be usefull? |
It's a recessive gene. It's not going to help to know who's had it. You have to understand genetics to understand how it works.
We used to think it was this dog, that dog. Having someone to blame made it make sense. It's more complicated than this.
Current research leads us to believe that liver shunt is a dominant trait with incomplete penetrance and no genetic marker yet. To further complicate things, no conclusion has been reached yet as to whether or poly-genetic. Because it's a dominant trait only one parent needs to be a carrier in order to produce liver shunt. But because there is no genetic marker we have no idea who the carrier is. You can breed a dog 25 times and never have a problem. Then breed him to a bitch that's been bred 3 times without a problem. Out of nowhere, this breeding it may reveal it's ugy head. Sharon Centers is working on a genetic marker. We're closer than ever.
You should do bile acids on puppies. However this is not going to tell you if they are carriers or not. It is a dominate recessive gene. We need a genetic marker.