The story of Roo! — the mixed breed stray dog who won a prize at this year’s Westminster Dog Show — is being developed as a feature film.

Elizabeth Fowler (“Devil’s Knot”) is producing, and Sharon Soboil, who brought the project to Fowler, is writing the script.

Roo was picked up by the Society for the Prevention of Cruelty to Animals in a park in San Francisco 5½ years ago. The Husky mix was adopted twice and returned twice for being too unruly; she was on the brink of being euthanized when she was adopted by Stacey Campbell, a Wall Street financial adviser who had recently lost her job as a result of the 2008 financial collapse.

Campbell could not find another job and started training Roo!, who won a special award for the best mixed-breed dog Feb. 9 at the Westminster show’s first-ever agility competition — marking the first time mixed-breed dogs had appeared at the show.  Mixed breeds, dubbed “all-American dogs” by the Westminster Kennel Club, cannot compete for the best in show trophy.

The agility competition judges dogs’ accuracy and speed on a course of jumps, tunnels, ramps and other objects as handlers guide them off-leash through calls and signals.

“The story about Roo! is as much about Roo! saving Stacey as Stacey saving Roo!,” Fowler told Variety.

Soboil is repped by Sue Giordano at the Hudson Agency and manager Eric Robinson at Gotham Group.