What can guard chickens?

Question by Sarah: What can guard chickens?
At my house, we have 13 chickens. They have a super protected coop that nothing can get in, and during the day we let them loose into a fenced in back yard to run around. When it starts to get dark, we open the gate to the backyard, they peck around for like 30 mins, then go into the coop for the night, and all we have to do is close the door. Last week, during the time that they were loose outside of the fenced in area, one of the chickens got taken away by a fox and was eaten, and weve been trying to keep an eye on the rest, but there are traces of the fox all around to coop, so we think hes sticking around since he knows theres more chickens. Is there any animal that we could perhaps buy to stick around with the chickens? So that maybe the fox will see something bigger and back off? we live in the woods, so not alot of neighbors, and my dogs are too rough with the chickens to be around them. they were inside the house when the chicken got taken last week. We were thinking maybe a goat? Of course I will read up on it more, but any suggestions are welcome!

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