Hi, this is WalkingOnSunshine. Saw the message that you sent about your lost hens. Since it's out where they're free ranging, I think you're probably right that it's a neighborhood dog. My only other thought would be a hawk, but if they are large breed hens most hawks will eat them where they kill them instead of carry them away. Hawks and dogs are the only predators I can think of that are active during the day.