With regards to killing foxes, they are a pest and will give thro anything if they fancy whats inside, and they do not kill jusy one, they will kill the lot, then take one. I can speak from personnel experience ! It aint nice finding it !!....
My sister is a keen rider, and she does go hunting

You Alex D got the nail right on the head, and are correct, Foxes are pests and will slaughter all chickens and take one, not kill one, plus as my sis says, the dogs only get the old slow foxes anyway
P.S I am not for it, I can see both sides, but although my family has horses, I still hate tha fookaz and think they stink