A 76-page primer of dog body language. Rugaas, a well-respected Norwegian dog trainer, has filled this book with lots of photos. It is easy to read and very accessible.
Yawn. Lick your lips. Turn your eyes and face away from your dog. Sit at 90° to her. All these are polite, calming, “peace, man!”, basic “words” that dogs instinctively know. Try it!
Recommended to me by international, veteran dog trainers Vero Chavez and Judy Shevelev.