I know this an old thread but I wanted to relate something.......... back in 66 or 67 me and my buddy harvey put 2 coon dogs out at a really large corn field. the field had a low place in the middle that had heavy brush and standing water, so the dogs headed down there and about a minute later they was back. they sat down close to us and refused to hunt the rest of the night.
these were big tough hounds that were normally scared of nothing. so, there must have been some kind of large predators back then.
I don't remember the county, but it was just south of Olney.