I noticed this thread without a resolution over at Mobius* which struck a memory chord with me. I was pretty sure this was from an episode of the anthology series DEATH VALLEY DAYS, and a perusal of a TVGUIDE.com episode guide of the show (a rare item online apparently) I found the episode which originally aired in December of 1963 (season 12 episode 10) "THE RED GHOST OF EAGLE CREEK". I'm pretty sure I would have seen this on some type of weekend syndication format in the late 60s early 70s. Here's the TVGuide episode description: "People on the Arizona frontier are terrorized by a mysterious animal with tracks three times as large as a horse's. Davidson: Paul Birch. Mrs. Davidson: Sarah Selby. Amy: Adrienne Hayes. Ned: Hampton Fancher. Sheriff: Trevor Bardette"
* not registered there, but enjoy reading it.