Never been to the Ozarks but big black cats are turning up everywhere and nobody in authority wants to admit it. We've had "panthers" spotted on the moors outside Sheffield for years and the official line is always the same - escaped exotic pet, misidentified dog, drunk witness. Gets old fast.
What did it look like up close, did it move like a domestic cat or more fluid and low to the ground? That gait is usually the giveaway. I've spent enough time in fields at stupid o'clock with recording equipment to know most people can tell the difference between a big animal and a small one, funnily enough.
Post any photos or even rough sketches, someone on here will know what they're looking at.