I am a book fanatic. I love Dean Koontz and probably have every book he's ever written (I also love Stephen King). The Darkest Evening of the Year is definitely a good book, and it does try to educate the reader somewhat on puppy mills and animal abuse. But although it is not a horror story, it does have it's supernatural elements.
The Odd Thomas series is very good, although the dog in those (Boo) is a white shepard.
For another good dog book, "Merle's Door, Lessons from a Free Thinking Dog" by Ted Kerasote is very good. It's not a fiction - and does reference some very interesting studies on animal intelligence.
Livin in a Newfie Drool Zone