In a recent article - "Do cats have emotions?", the author, Sarah Hartwell has done a deep study on the emotions of cats. We may consider a broader questions whether animals have emotions, and what type of emotions can be expect?
Some excerpts from Sarah's article:
"Emotion" is the term we use for feelings, some of which are instinctive and some of which are learned from those around us as we conform to society's expectations and norms. Human emotions range from "primitive" feelings such as disgust, rage, fear and lust to "complex" emotions compassion and jealousy.
Recent studies, especially in fields such as neuropsychology, show that the more "primitive" or basic emotions have a physiological basis and may be caused by chemical stimuli (such as sexual attractant scents called pheromones) or visual stimuli. Basic emotions appear to cause chemical changes in the body in response to a stimulus.
Do cats (and other higher animals) have feelings? Can they respond emotionally?"
http://messybeast.com/emoticat.html