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Originally Posted by Ladymom Chihuahuas aren't a breed that has a high occurrence of liver shunts. What breeds are commonly affected with shunts?
Small breed dogs tend to have shunts that form outside of the liver ("extrahepatic"). In the United States, Yorkshire terriers have almost a 36 times greater risk of developing shunts than all other breeds combined. Extrahepatic shunts can be seen in any small breed but are also reported commonly in schnauzers, Maltese, dachshunds, Jack Russell terriers, Shih Tzu, Lhasa apso, Cairn terriers, and poodles. Large breed dogs tend to retain the fetal liver shunt (patent ductus venosus), or "intrahepatic" shunts. In the Netherlands, about 2% of Irish Wolfhounds are born with intrahepatic shunts. Intrahepatic shunts can be seen in any large breed dog and have been reported in some small breed dogs (especially poodles); in the United States, we see them most often in Labrador retrievers. Australian shepherds, Australian cattle dogs, Samoyeds, and Old English sheepdogs are also commonly reported. Portosystemic Shunts FAQ |
I was just reading this same site about 10 minutes ago.

Would it still be recommended to go ahead and do a bile acid test? Or should I just try the Hills U/D for the 2 months and then see how she reacts to that? She doesn't have any symptoms, apart from the crystal thing. I don't know how relevant this is, but when she was younger, she had juvenile vaginitis. It cleared up after her first heat. I don't know if this could be causing the issue was well? Thanks for your help and the link!