It could very well be a fox as well. Our coop is roughly 20 or so feet from our house. We have dogs, and we chain them outside when they want to go out which allows them about 10 feet of room to move around in any direction. I am sure the smell of dog is very strong. Anyway, all of our dogs were inside, and we heard the chickens suddenly panic. Running outside, we saw a fox jumping up onto our chicken wire, at least five feet in the air!! One of our poor hens flew OUT of the run and the fox quickly snatched her up and ran into the long grasses. There was no blood, and no feathers. I chased after the fox with my dad, and apparently, little did the fox know, there was a rather big, steep ditch. Because of this, the hen managed to escape. I saw the tall grasses waving, and saw her pop out and run towards the coop! She had no injuries and no loss of feathers whatsoever. So, I think, the likelihood of it being a fox is pretty high, as well as many other predators, such as raccoons, coyotes, owls... I wouldn't suspect a mink or weasel. We had a fischer get into our coop one day and decapitated a hen. Those things are VERY large up here, at least half the size of a fox. And even at that size, he didn't even bother to carry it off. He WAS back for many days after that though, searching for a way inside.
