Watch The Mustang (2019) HD Full Movie Free on solarmovie.do. Watch The Mustang (2019) online free. While participating in a rehabilitation program training wild mustangs, a convict at first struggles...While participating in a rehabilitation program training wild mustangs, a convict at first struggles to connect with the horses and his fellow inmates, but he learns to confront his violent past as he soothes an especially feisty horse.