When it comes to the war on terror, bomb-sniffing dogs are essential companions. When it comes to your sex life, no animal provides blissful privacy like a cat. So which is the superior domesticated animal? In this episode, the canine partisans Adam Gopnik and Malcolm Gladwell duke it out with the feline lovers Ariel Levy and Anthony Lane to settle the debate once and for all. Also, Lauren Collins talks with the British actor Damian Lewis about playing the part of an American on “Homeland” and “Billions,” and the late architect Zaha Hadid speaks with John Seabrook about her early life.