On my block, a lot of people walk their dogs, and I always see them walking along with their little poop bags, which to me is just the lowest function of human life. If aliens are watching this through telescopes, they're gonna think the dogs are the leaders. If you see two life forms, one of them's making a poop, the other one's carrying it for him, who would you assume was in charge?
Part of Jerry's nightclub act. He posits that in human/pet interactions, the pets are dominant.