Photos: World's Ugliest Dog contestants 2013

The 25th annual World's Ugliest Dog Contest celebrates its 25th anniversary at the Sonoma-Marin Fair in Petaluma, California, on Friday, June 21. Contestants like Princess Abby, seen here, vie for the honor of being the world's ugliest dog and a chance to win $1,500 and a trophy. <a href='http://www.cnn.com/2013/06/21/living/vote-worlds-ugliest-dogs/index.html'>View past winners</a> or click through to meet the contestants.

The 25th annual World's Ugliest Dog Contest celebrates its 25th anniversary at the Sonoma-Marin Fair in Petaluma, California, on Friday, June 21. Contestants like Princess Abby, seen here, vie for the honor of being the world's ugliest dog and a chance to win $1,500 and a trophy. View past winners or click through to meet the contestants.