I think emotion developed in the brain first.
Eventually, emotions developed into thoughts and thoughts developed rationality and rational thinking.
It does not surprise me that animals have emotions. Emotions came before thought.
They are driven by results.
Humans are plagued by emotions. Animals may have emotions, but they are much less powerful than human emotions.
Wild animals are fighting on the front line of survival (domestic animals are not that removed from the same kind of survival).
Emotions get in the way of survival...however much emotions are experienced by humans and animals, they are a luxury when survival is hanging by a thread.
That said, I live around many yard animals and household pets. I find them to be bright, driven, aggressive...and when they are secure in their position, they can be incredibly loving (i.e. emotional).