Dogs display similar emotions just as humans do. They communicate these feelings through body posture, growling and barking, and their senses.
Dogs appear to experience emotions like sadness, joy, anger, and fear. But they also exhibit love, distress, excitement, suspicion, and more. They display each through different mannerisms and actions.
Additionally, dogs can interpret human emotions and often react accordingly. If you get angry at them, they may act submissively or scared. If you feel happy and excited, they'll feed off that energy. They effectively "catch" our emotions. After thousands of years of cohabitating and adapting together, we really can't be too surprised!