[ananana]

Great input, Hamhack.

I don't know if this will add much, but wouldn't you need theory of mind to feel and express emotion?
And animals do express emotion.
When I was sick with the flu, my dog was able to sense something was wrong and tried his best to comfort me.
My other dog was depressed and moped around when my parents went out of town.
I guess that kind ties to what Jewpin had to say. We're just more advanced.