Photos: Most popular dog breeds in U.S.
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#6 - Yorkshire Terriers. NEW YORK - FEBRUARY 13: Emma Echols competes with her Yorkshire Terrier 'Tucker' in the Junior Showmanship Preliminaries at Westminster Kennel Club Dog Show on February 13, 2012 in New York City. The Westminster Kennel Club Dog Show first held in 1877, is the second-longest continuously held sporting event in the U.S., second only to the Kentucky Derby. (Photo by Michael Nagle/Getty Images)
