Vegan

But it could be hard to ever pinpoint exactly, which animals do.

So that's why we should err on the side of caution, assume that animals who act like they have emotions actually have emotions, and give them the respect and rights they deserve as fellow thinking feeling beings?

Oh wait, no, let's torture, kill, and eat them because we can't "prove", to whatever arbitrary "scientific" standard, they have the same intellectual and emotional capacities we do.