I always thought Wildfire borrowed heavily (in theme if not melody) from Roger McGuinn's supremely silly horse song, Chestnut Mare. Now if you want illogical lyrics, Michael Murphey's got nothing on ol' Rodg. (But for the record, I do like both songs.)
I've only heard that song once in my life, but it creeped me out something FIERCE. "I'm gonna catch that horse if I can / I'm gonna make that horse wear my brand," or something like that? Someone call PETA!
And if my ears don't deceive, Fleetwood Mac later nicked that pretty opening for their moderate hit "As Long as You Follow," the single from their (1989?) greatest-hits comp.