All pet would say ‘Yes’. Molly the dog and Whiskers the cat can feel angry, depressed, neglected, happy, even jealous and guilty.
Many scientists, however, are sceptical about giving animals the full range of emotions that humans can feel. Part of the problem is that it is impossible to prove that even a human being is feeling happy or sad. In fact, it is only because we can observe body language and facial expression that we can deduce it. And of course humans can express the emotion with language. However, most researchers do agree that many creatures experience fear. Some scientists define this as a primary emotion.