When I was younger something was reportedly roaming around the local hills that my family members were calling, "White Thang." It was, I believe they said, about the size of a large dog, white in color, and "screamed like a woman". Also, it killed my cousin's dog, they believe. I think the dog lived for awhile, since it seems like they took it to a vet, but the vet couldn't save it.
Since according to the older folk, there used to be "wild painters" here (as my grandmother called them), and some say there still are, and since even if there aren't any here anymore one might have wondered through (stranger things have happened), I thought it might have been a mountain lion- a white one. I mean, they can make a sound that has been described as sounding like a woman's scream. According to wikipedia (
http://en.wikipedia.org/wiki/White_panther), a white one would be really rare, however, as it said, "A white panther may therefore be a white Cougar, white Jaguar or white Leopard. Of these, white Leopards appear to be more common, although still very rare," which would mean a white cougar or mountain lion would be a really rare find indeed. It's still not an impossibility, however and it's the most reasonable thing I can think of to explain White Thang. I believe in ghosts, but I don't think the majority of them have the habit of (or ability to) kill a dog. Although, taking poltergeists into consideration, I wouldn't say it couldn't happen. I'm just putting the white, but living, painter as my first choice of an explanation. If that falls through, then we'll go with a ghost painter.