I have "The NEW Encyclopedia of Dogs" by Bruce Fogel, and The Dog Bible also mentioned.
"The NEW Encyclopedia of Dogs" by Bruce Fogel is the way to go. It is awesome, exellent, brilliant. It has MILLIONS of breeds in it, including breeds begining with X that I've never even heard of. This book is a must have for any dog lover, I find that the bible is very informative also but I've noticed alot of editorial errors in it like missed out words and spelling mistakes. I might just be a freak but personally that puts me off believing the information in a book, especially one I spent $40 on.
Bruce fogle is exellent though. I was given the book and I love it, Its got so much info in I haven't read it all yet but its just so good. It has brilliant colourful pictures in too. Information about where dogs originated from, dog health conditions and stuff. I totally recommend it, cannot stress enough how much!