These dogs may look like they've had a ruff night - but this week one of them will be crowned the World's Ugliest Dog. The World's Ugliest Dog Contest pits mangy mutts from around the globe against each other to discover the worst-looking canine. Now in its 26th year, the contest takes place annually at the Sonoma-Marin Fair in California. In this image the pet contestant Peanut is shown.

Contestants will be judged in four main categories - first impressions, unique features, personality and audience reaction. The winner will not only claim the title of being the most aesthetically displeasing mutt on the planet but will also net its owner $1,500 in prize money. In this image the pet contestant Willie Bean Walker is shown.

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