Anders Hallgrens’s book “The ABC’s of Dog Language” is the best primer on dog language I’ve found to date. It explores how dogs communicate through body signals and movements, sounds, smells, and touch. With clear text and illustrative photographs, the author explains the nuances of dog language, including body postures, facial expressions, and the vocal language of dogs.
If you only have time to read one book on dog language, this is the book to get. Originally written in Swedish and translated into English by Mogens Eliasen and Pauline Kesteven, “The ABC’s of Dog Language” is currently hard to find unless you go to K9Joy.com (Mogens Eliasen’s website) to purchase it.