A two-year-old dog called Peanut, of suspected Chihuahua-Shitzu heritage, took the coveted title of World's Ugliest Dog at the annual competition in California.
Peanut's owner, Polly Chandler, of North Carolina, said the pooch was seriously burned as a puppy, resulting in bald patches all over his body and she hopes Peanut's award will help raise awareness of animal abuse.
"We're trying to use him as a poster child for what can happen to animals who are abused," she said.
She plans to use the $1,500 (£880) prize money to pay for other animals' vet's bills.
The contest, which is in its 26th year, judges dogs in several categories, including special or unusual attributes, personality and "natural ugliness".