This sounds like what happened to my basenji a few years ago. He became very jaundiced and almost died. The vet said he had a defect in his porto-systemic shunt. His liver enzymes were through the roof and he had severe cirrhosis. At first, he was on a lot of medications, including prednisone, vitamin E, milk thistle, sam-E, and a prescription called ursodial. Also, the low protein diet. He HATED the Science Diet liver disease formula! I mostly cook for him. Chicken or turkey boiled with some rice and vegetables. Sometimes, he’ll eat some egg or cottage cheese. I add a small amount of dry dog food(Pedigree), for fiber. The high-end dog food isn’t the best in this situation. You actually WANT to use a dog food with more fillers. The milk thistle is the most important thing for detoxifying the liver. The prednisone will make your dog ravenously hungry and cause his muscles to atrophy, so don’t keep your dog on that too long. I hope this helps. My dog was diagnosed after his 11th birthday, and the vet didn’t expect to live more than a year. He’s almost 16 now! Good luck!
Correction: The vet didn’t expect my dog to live more than a year.