I have found Dr. Tobias at the University of Tennessee to be a good resource for liver shunt. Her program has a support line available to the public. Once you contact them they have someone take your information and create a file on your dog. I have called and have several friends that used the service. My first call was about 45 minutes. They answered every question I had. I was very pleased. They also perform liver shunt surgery but will support you if you decide to have it done locally. This is just my limited knowledge and experience.
Portosystemic Shunts FAQ
The good news is that liver shunt can be treated.