An old neighbor of Lisa’s was recently caught having sex with his Labrador retriever, and when I told Louis about it, he asked if the dog could get pregnant. “Are you serious?” I said. “How old are you?” That’s one of those things you think about when you’re a child, the possibility of a half boy/half pony. If it were possible to crossbreed like that, the world would be full of talking goats and sheep who could shear their own wool.