I have heard good things about this book: http://www.amazon.com/Dog-Food-Logic-Decisions-Choices/dp/1617811386/ref=sr_1_1?s=books&ie=UTF8&qid=1392962076&sr=1-1&keywords=dog+food+logic
“Dog Food Logic is an indispensable book for any pet owner who wants to make thoughtful, informed decisions about what to feed his or her canine companions. The dog food industry is a bewildering, ever-changing landscape of companies and brands, and dog owners are inundated with marketing masquerading as science, with rigid advice from self-declared experts, and with fads every bit as intense and short-lived as those in the human weight loss business. Dog Food Logic cuts through the noise and chaos and provides pet owners with a rational, science-based approach to evaluating their pets’ dietary needs and their feeding choices”. excerpt from: http://skeptvet.com/Blog/category/nutrition/
