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To solidify the point that the dog has emerged--above expensive restaurants, home furnishings and even security--as the status symbol of the times, Martha Stewart's company will launch this fall a weekly pet-keeping show with Marc Marrone as host. No one in the canine cognoscenti will want to miss the episode on how to brush a dog's teeth. --Reported by Jeanne DeQuine/Miami, Jeanne McDowell/Los Angeles and Deirdre van Dyk/New York