 And not just intelligence and the capacity for some kind of thought, but emotion. Like for a long time, serious scientists would be laughed out of the lab if they described animal behavior in human terms. And yet, like the fact that my dog leaps around and seems very excited when I show her the package of her favorite snacks and is interested but maybe less thrilled if I rattle the jar of boring milk bones, I feel compelled to describe her reaction to the good snacks as joy.