Feeding a Fox will only encourage it to make even more regular contact with Humans, leading eventually to someone being bitten.
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you don't want the fox to get too friendly with humans as humans are a risk to it
I once built a very close relationship with a male fox. At first I tried to keep him at arms length, fearing that if he became too friendly it would put him at risk from not very nice people. However despite little encouragement from me, he slowly became completely relaxed in my presence to the point where he would sit down right next to me, even with his back to me. Sometimes I would be in the garden and turn round to see him next to me. He wouldn't even bother making eye contact and was so relaxed that he would yawn, groom, etc, right next to me. He would also come if I whistled.
Yet despite all that I had nothing to fear, because just like a domestic dog he could tell the difference between me and strangers which he did not trust. Every evening he would have his dinner on my front door step and I would normally sit down next to him. Sometimes he would suddenly stop eating and trot off to hide under a bush, this was because he had heard someone coming along the road, as soon as they had gone past he would come out and carry on eating. He just didn't trust other people even though he trusted me. And he trusted me enough btw, to bring his entire litter of cubs to see me when he had some.