Updated: Feb 1
A dog’s ability to express emotions is same as that of a two and a half year old human child.
It is capable of feeling and communicating emotions such as excitement & joy, jealousy, suspicion, shyness, distress & sorrow, disgust, anger, fear, contentment, love and affection.
Since time immemorial dogs have been amiably living around human species and are the oldest domesticated animal. In the course of co-existing and evolving together dogs have come to understand humans and communicate with them effectively by picking up cues via body language, familiarity of voices and smells.
Italicized excerpt from: https://www.petsworld.in/blog/can-dogs-think-and-how-much.html