My wife pointed me to Casteel's website a few months back, so when a friend of a friend (I think) posted a review here, and I discovered there was a book, I just had to get it (reasonably priced too!)
It's not very long, but her reaction (and mine, when she let me look at it) was priceless. Even if you think you know dogs, you have never seen pictures like this until you've seen Casteel!