It's fun to speculate about what kind of dog the Obamas will get and to picture Malia and Sasha romping with their new pet on the White House lawn. But the Obamas should take this decision seriously. Millions of Americans will copy the first family, so they ought to choose a breed that could live happily in most American homes. The latest word is that they are leaning toward a Portugese water dog. [A moment of stunned silence, please.] A Portugese water dog? What can they be thinking? Is someone in the family a full-time fisherman who needs a diving...