DOGS COMMUNICATION

Dogs communicate in several ways. The scent is one method, another is physical appearance. Body position, movement, and facial expression often convey a strong message. Many of these signals are recognizable even to humans, such as the excited tail-wagging of a happy dog or the bared teeth of an angry or threatened animal. Vocally, dogs communicate with a cacophony of sounds including barks, growls, and whines. 

Source: 
https://www.nationalgeographic.com/animals/mammals/d/domestic-dog/