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As Halloween has grown in popularity across the country, pets haven't been left out. In 2010, 9 percent of dog owners surveyed by the American Pet Products Association said they bought a Halloween costume for their dog. PetSmart Inc., one of the largest pet costume retailers, won't divulge how many they sold last year, but dog and cat apparel buyer Reyna Jew said they more than doubled their assortment this year. The most popular costumes are bees and pumpkins.