My pet-sitting day ends around sunset, and it's very satisfying to know that I've made several living beings happy that day. That I left their food bowls sparkling clean and fresh water in their water bowls. That I brushed them so their coats shined, and played with them until all our hearts were beating faster. That I kissed them goodbye and left them with their tails wagging or flipping or at least raised in a happy kind of way. That's a heck of a lot more than any president, pope, prime minister, or potentate can say, and I wouldn't switch places with any of them.