The Humane Society of the United States has tapped Richard Elson’s “Shadow Trade,” centering on trafficking of Thai street dogs, as winner of its $20,000 documentary grant for animal content in entertainment.

“Shadow” was chosen from more than 60 entries from 20 countries. It follows the covert work of a British journalist who ventures deep into an underground world with the hope of advancing stricter laws and more protection for dogs in Southeast Asia.

The panel of judges were from HBO Documentary Films, Sundance Channel, Participant Media, Documentary Channel, Cineflix Productions, Gravitas Ventures and Green Planet Films.

Runner up was “Horsepower,” which looks at the crucial role horses have played in the formation of America and the issues facing their welfare today. Past winners of the grant include “The Eyes of Thailand,” narrated by Ashley Judd, “One Lucky Elephant,” which aired on the OWN network, and “The Elephant in the Living Room.”