I, I guess I should say my chickens, have had a couple of run ins with the fox.They will attack at ANY time, NOT just at night, I learned that the hard way. And they won't just take one either, they will wipe you out. I used to free range my flock all day. I got away with no problems for almost a year. Then it happened, I lost 9 out of 11 birds in one April afternoon. The attack happened between 11:00AM and 2:00PM. That's when it happened because my wife left for the store and all was well. My daughter got home from school, and usually the birds would run up to greet her. Not on this day. She called me at work and told me how there was piles of feathers all around the yard, some right up by the front door of the house. We found the rooster and one hen hiding in one of the nest boxes, terrified. So we started a modified free range for them. Somebody had to be home to watch out for them when they were out. We got 20 new chicks and more or less started over.
Things went well for awhile, the new birds grew up and just started laying eggs. Then one day, they were out and we had to leave the house for just a short time. Again, it was my daughter who came home and interrupted this attack, at 5:30PM. This time, we lost 6, she saw the fox running off with one. Well that burned me. I bought one of those big box traps. Never caught a fox, but I "Relocated" a few racoons. I had a shot at him early one morning, but I was too bleary eyed from just waking up (Old fart that I am) and could not properly focus on the sights and missed him, but I sprayed lead after him all the way to the woods. I ended up buying an electric poultry fence from Premier. I ran electric down to the coop, needed to do that anyways. I didn't want to play around with a solar charger, I wanted good old reliable AC voltage for the fence. The fence, according to my voltage tester, is cranking out 7000V. I'd LOVE to see that fox nose up to that. The fence has only been up about a month, but I feel a lot more comfortable. The fence is 4ft high, but the birds stay in it and they get to come out early in the morning and spend all day outside. I have an area 50X100ft fenced off for them. I'm thinking I'm going to get another 100ft section to add on. We call it the playpen. Good luck with getting that fox, next to a stray dog, I think they are the worst predator you can have.
Jack