I just read this book called, Saving Gracie. It is about a puppy mill bust and it follows Gracie a King Charles Cavalier who was born and used as a producer for a puppy mill for 6 years of her life.
I cried just about the entire way through... It is a touching story and it makes me want to reach out and help so many little ones in need. If your interested check it out.. but be prepared to cry.
Carol Bradley » Author of Saving Gracie - The true story of one dogs rescue from a Pennsylvania puppy mill. 
Amazon.com: Saving Gracie: How One Dog Escaped...