Dispatching them is really the only option, unfortunately. We had a feral/wild cat show up at our property a couple of months ago and didn't even think about the possibility of it attacking our chickens...until it did. My husband caught a glimpse of it running away the first time it attacked them, but wasn't positive what it was. We didn't catch sight of it again until a week after the second attack, during which it killed one of our hens. Though we weren't able to take care of it the last time we saw it, I guarantee you the next time we see it, we won't ever have to worry about it attacking the chickens again.