Patricia McConnell has a slew of wonderful books. Some are short booklets addressing a particular behavior issue. She co-authored Feisty Fido with Karen B. London, Ph.D. and this is a must read if you have a reactive dog. But above all, YOU MUST READ The Other End of the Leash. It will completely change your perspective about dogs.
Pat Miller’s The Power of Positive Dog Training set me on the path of positive dog training and saved my dog, Molly’s life. She also has a number of other books that are eminently useful and very readable.
Jean Donaldson’s Culture Clash will also give you a completely new perspective on dogs. Like Patricia McConnell and Pat Miller, her books are very readable and filled with great stories.
The Whole Dog Journal is a monthly newsletter that has articles on dog behavior training, health, food and almost anything else you can think of.