My parents' dog showed early signs of liver failure last year. They've since switched from feeding the cheapass kibble to a home-prepared diet. He's doing as well as can be hoped for a 15 year-old. This is the book where they get their recipes:
http://www.amazon.com/Home-Prepared-Dog-...293&sr=8-10

This site http://www.dogfoodproject.com/ has some helpful articles on selecting foods by examining the ingredient list.