IMAGE DISTRIBUTED FOR PURINA - In this image released on Monday, March 4, 2013, Kirby McIlveen competes in the freestyle flying disc competition with her Border Collie Sketch during the Purina Pro ... more 
IMAGE DISTRIBUTED FOR PURINA - In this image released on Monday, March 4, 2013, Kirby McIlveen competes in the freestyle flying disc competition with her Border Collie Sketch during the Purina Pro Plan Incredible Dog Challenge at the Rio Hotel and Casino in Las Vegas. (Photo by Isaac Brekken/Invision for Purina/AP Images) less 
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Associated Press
Mon, Mar 4, 2013 11:58 AM EST