Bark! The Herald Angels Sing will bring a smile to even the most devoted Scrooge. Decked out in the finest of holiday garb, strutting against backgrounds that evoke locales as varied as Charles Dickens' London and the ice floes of Antarctica, an adorable dog strikes a pose. Another Christmas card in the bag. But the scenes weren't always so ornate. Photographer Peter Thorpe's first dog holiday shoot went more like this: dog, pair of antlers, red...