Nothing expands your understanding of your canine partner quite like new information.

Here are books from the positive reinforcement category and science based rather than dominance based theory.

Bones Would Rain from the Sky
by Suzanne Clothier

The Dog Whisperer
by Paul Owens and Norma Eckroate

Choose to Heel
by Dawn Jecs

The Culture Clash
by Jean Donaldson

Help for your Fearful Dog
by Nicole Wilde

Clicker Training for Obedience
by Morgan Spector