You're right about not being able to scare a fox away for good when there are chickens about. And trapping the things is most difficult so a gun is the only solution.(Barring keeping the chickens locked up.) However, healthy foxes can be out during the daylight if the foxes have a family to feed and that is when they can get food. When there are kits to keep full just about all the time is spent looking for food.You can't scare a fox away for good. As long as you have chickens they will come back. It would be best to shoot them. If they are they are taking chickens in the daytime then somthings wrong with them, and you wouldn't want your dog killing them and getting sick.