Here is a great link to information from Dr. Center. She is one of, if not, the leading authority on liver diseases in the US. She developed the bile acids test. It should answer a lot of your questions:
http://www.vin.com/proceedings/Proce...2675&O=Generic
This has been my "bible" for dealing with Lady's epilepsy:
http://www.canine-epilepsy-guardian-angels.com/