Outlook on canine liver disease?

Last Wednesday my male dog looked pregnant so we took him to the vet. He had retained water in his belly and after blood test we found out the liver was not acting right. So he was put on 4 medications and in 2 days the water was gone and he quit eating and started to throw up almost everything he ate. So today (Monday) we took him back to the vet and my 15 lb dog now weighs 10 lb. They looked at him and immediately sent him to an emergency room 1 hour away. The emergency vet didn't know what was wrong with him but because he isn't saying we left him there and he will receive a catheter and IV. What do you think his outlook of recovering or what could be wrong with him. He is also acting strange, he goes places he hasn't before and stares at the wall and stuff.