Not from the Ozarks but this keeps coming up in UK sightings too and I've always been curious about the reporting patterns. When you say big, are we talking labrador-sized or genuinely puma-scale? That detail seems to split witnesses pretty sharply in my experience looking into the British big cat stuff.
Also - third sighting this month by the same person or three separate witnesses? Because if it's multiple independent reports that's a whole different weight of evidence isn't it. I've been tracking a cluster of sightings down in Hampshire for about two years now and the consistency between unconnected witnesses is honestly what made me take it seriously.
Do any of the witnesses describe the gait or movement? People who've actually seen large felids always mention how different the walk is, that fluid low-to-the-ground thing. That detail tends to separate genuine sightings from misidentified dogs in my experience.