First of all, if you even suspect liver failure, go to a vet. Signs include loss of appetite, vomiting, diarrhea or constipation. Chronic weight loss, orange urine or grey feces.
Liver failure is very serious business and you should get the dog to the vet imediately. They may be able to help the animla but if you wait to long there will be nothing they can do and I am sure you do not want to lose your friend. I hope this helps.
