PAW'S CORNERBy Sam MazzottaMutts Capture Owners' HeartsDEAR PAW'S CORNER: What is the most popular dog in the United States? And what about mixed breeds? -- Jane in Tuscaloosa, Ala.DEAR JANE: Good question! Everyone has their favorite dog or cat, but a number of surveys are done every year trying to figure out which breeds are the most popular. According to the American Kennel Club, the most popular dog breed in 2012 was the Labrador Retriever, which has reigned supreme for a decade. Rounding out the top five are German Shepherds, Golden Retrievers, Beagles and Bulldogs, although Yorkshire Terriers often contend for a place on the list, coming in no lower than sixth since 2002.A recent survey conducted for pet food company Royal Canin revealed another heartening statistic. More than 40 percent of cat owners and 28 percent of dog owners preferred mixed-breed pets, rather than purebreds. This is encouraging to read, because more owners are choosing pets based on factors other than breed alone.So, how do dog owners choose their pet? According to the survey, size was the No. 1 factor in their decision of which kind of dog to adopt or purchase.Among cat owners, a cat's appearance was the top factor in choosing their feline companion, according to more than 55 percent of those surveyed.So, while the even-tempered Labrador Retriever continues to be a popular choice for American families, owners looking to adopt a mutt stand in good company with other pet owners. Send your questions or comments to ask@pawscorner.com. Did you know mosquitos can transmit heartworm larvae to dogs, but fleas don't? Find out more in my new book, ÒFighting Fleas,Ó available now on Amazon. (c) 2013 King Features Synd., Inc.