We had something running into our yard, right next to coop/run area and grabbing a bird every other day, including a big BR rooster. We thought it was a fox. Then DH walked right up on a big bobcat the other morning at 10:00 in our barn - I guess waiting for me to let his breakfast out of the coop/run area. This bobcat was not afraid of our German Shepherd or our other three dogs that run with our free range flock. It would just wait at edge of woods till it saw it's chance, maybe when the dogs were away for a bit, and then run up and grab a bird. Since then we've been keeping the chickens in the run hoping the bobcat will go elsewhere. Plus it's hunting season here and the woods behind our barn are full of hunters. I hoping someone shoots it. I do know the dogs pick up it's scent dozens of times a day and go chasing it through the woods but it kept returning. We haven't lost any birds over the last two weeks since we spotted the bobcat but we're keeping them locked in fenced area - though a few jump/fly the fence. I thought maybe the bobcat was gone but just yesterday and again just now the dogs took off after something through the woods again and you could here it running and I'm guessing it's the bobcat. So I don't think they ever give up. You'll need to have a secure run.