Dog books

You know, I love dog books. I've read Marley and Me by John Grogan. I adore Cesar Millan - own his Cesar's Way and just purchased his new book, Be the Pack Leader. I'm currently reading a fascinating book called Merle's Door - Lessons from a Freethinking Dog by Ted Kerasote. I went to Mr. Kerasote's webpage today and the slide show of Merle had me tearing up - and I haven't even finished the book.
Maybe because my own dogs are so special to me. Amazing personalities. One of my mini-Schnauzers Mitchell, watches TV. He loves to see dog videos on You Tube and can even see dogs in magazines. I've never had a dog that could do that.
In Merle's Door, one of the things that got me was the author mentioning how Merle could comment "ha ha ha" by panting. I've had dogs that communicated that way - my Border Collie (now deceased) Cody was nicknamed Roe Roe for his way of saying that. My young boxer Mac makes his own sounds, "Meh Meh" is one of them, and he has a rumbly kind of rowwwwl he does when he thinks he's not getting enough attention.
Anyway, I'm enjoying the books. Quite different than fiction, which I need sometimes.

So what kind of non-fiction books do you enjoy?