Very short, and very good, book about how to socialize your dog. Almost all other books about dog behavior focus, in the practical aspect at least, on obedience training, which is getting your dog to do things you want them to by making them focus intently for a short time. Most of the time, your dogs aren't focused on your commands (unless you want to give them commands all day), so this book -- a book that teaches you how to train your dogs to follow a social structure well -- is invaluable. It's not fancy writing -- Rick Dillender is a trainer, not a professional writer -- but the book is clear, the advice is useful, and the message is reinforced.
General thesis of the book -- teach your dog to be agreeable as well as obedient, and do so mostly by teaching your dog the way dogs teach other dogs.