If you can trap the fox you may have a wildlife rescue in your area that will take it. I had an owl kill some of my birds. I did accidentally catch the owl and got it in a cage and a wildlife rescue came and got it. They said they had a release area and it shouldn't be back. When I originally put the netting over my pens I was short so I bought some netting online but it wasn't what I thought it was and an owl went through it and killed some birds. I moved the birds to a different coop and pen and put a camera in it. The owl came back and went through the netting again. Each time the owl went through it I put a new piece up. I have since replaced it with some good netting and the owl tried to go through it but got caught. I have seen some owls but they haven't tried to get to the birds.