Originally Posted by GRUNTERSDAD
This from Wikipedia. Only an excerpt but again there is nothing definitive since they can't speak.
While humans have had differing views of animal emotion, the scientific examination of animal emotion has led to little information beyond a recognition that animals have the capacity for pain and fear, and such responses as are needed for survival
And happiness, affection, playfulness, expectancy, sulking ... pretty well anything a toddler can throw at you.
Plenty of pet owners will agree with this and we're not all anthropomorphising.