The National Research Council of the National Academy of Sciences has reviewed their recommendations for dog and cat nutrition, and published an updated report. The entire 400-page report is available for purchase from the National Academies Press, but the executive summaries have been released as free, easy-to-read, download-able pamphlets in PDF form. Please click on the dog or cat for the download pages:
These pamphlets contain helpful information that pet owners can use to make more informed feeding decisions for their pets, including specific nutrient needs, characteristics of different types of petfoods, and factors to consider when feeding cats and dogs.
Only 14 pages, with clear diagrams, simple tables, and wonderful photos of cats and dogs, it's a pleasant 5 minute read, and you can keep it handy for future reference.