Emotion is defined as any mental experience with high intensity and high hedonic content. The existence and nature of emotions in animals are believed to be correlated with those of humans and to have evolved from the same mechanisms.
Believers, however, typically opine that animals are capable of a range of emotions, such as happiness, sadness, empathy, grief, curiosity, anger, anxiety and fear. So a naughty dog that goes on the carpet and gnaws up everything is probably not actively trying to punish its absent person for being gone so long. But it might be feeling lonely and anxious, and not know how to behave when left on its own for so much time.
Emotions might have evolved out of social necessity, helping animals adapt to different situations. Animals raised by themselves don’t learn all the social niceties involved in getting along with others.
Animals respond to the environment much as humans do, reacting emotionally to others and even becoming stressed and anxious in times of danger. These emotions have a marked effect on their behaviour but while researchers may never be able to know how animals actually feel, studies have found that there are definite behavioural similarities in emotional expression between animals and humans.
So,we can say that animals also have emotions like humans.