My Trooper had liver shunt and had surgery last July for it. His surgeon still recommends that he be on a low or non-meat protien diet such as Royal Canin Hepatic LS 14. I also found a Liver Disease Yahoo Group that also recommends this food. You should check the group out - they've helped me out alot!! They are willing to help you learn and recommend food, anything that will help you help your furbaby. Here's the link:
DogLiverDisease : Dog Liver Disease