https://news.ycombinator.com/item?id=38769813
I don't think people are surprised that animals have thoughts and emotions. No farmer I know of thinks cows aren't capable of being trained: the ones down the road from my parents line up in an orderly queue to go into the dairy every morning and afternoon, including leaving a gap across the road and giving way to cars.
On the other hand, a lot of people who claim animals have thoughts and emotions seem to think that cows have complicated human-level thoughts like "I am an oppressed cog; my owner will send me to the glue factory when I am too old to give milk, and yet I must queue up regardless, for my spirit is broken; my calf has been taken and I will never know if he got a college degree; life is pure suffering." This seems unlikely to be true.