I don't think one can say that animals don't weigh reasons the way humans do. It's just a matter of wildly different horizons of possibility and life circumstances. The wolf in Siberia doesn't think about leaving the pack and taking the job in the U.S. because this choice is outside of his life circumstances. He may have other choices where the answer is almost always very clear (which presents itself to us as low complexity, almost automatic thinking) because the wolf lives in a much less complex (social) world. We have to remember that our human world in which "a job" is a "thing" is nothing but a giant fantasy and in this fantasy there are much farther reaching choices to make than in the world of an animal. So I'd say, we are the same as animals on a functional level but with more self-made delusional complexity of the world we live in.