When Michael Schaffer and his wife drove to a rural animal shelter and adopted Murphy, a mistreated Saint Bernard, they vowed that they'd never become the kind of people who, say, get their dog a facial treatment. But then they started to get weird looks from the in-laws: You hired a trainer? Murphy is on antidepressants? It turned out Murphy wasn't alone: yesteryear's pooch has moved from the backyard doghouse to the master bedroom, evolving from man's best friend to bona fide family member. "One Nation Under Dog" is the beloved chronicle of this new world of American pet mania. Schaffer, guided on occasion by Murphy, provides a surprising, lively, and often hilarious portrait of our country - how the way we treat our pets reflects evolving ideas about everything from science and consumerism, to politics and family - through this fabulously reported and sympathetic look at both us and our animals.