Northwest Stampede (movie, 1948)

In this romantic western, the real stars are a mustang and a police dog. The human aspect of the story centers on a rodeo rider whose late father bequeathed him a ranch in Calgary, Canada. The rider really tries to settle down to ranching, but finds himself pining for the rodeo. His forewoman, also a former rodeo performer, thinks her employer is shirking his duties and needs to forget about broncos, and bull-riding and settle down. Meanwhile, the fellow also longs to catch the white stallion running wild. The dog helps out.