By Katherine Leviste
Next Thursday, T.V. viewers across the country will watch Nova Scotia Duck Tolling Retrievers, Portuguese Water Dogs, and other purebreds trot around the Greater Philadelphia Expo Center in a Thanksgiving tradition that ranks right up there with parades and football: the National Dog Show. As the dogs sit, stand, and jog, licensed judges evaluate them based on a set of standard character and physical appearance expectations for each breed.
Behind those expectation