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My run has been fox probed at least ten times, all in the first two months or so.
If you don’t have the option of a sturdy mesh floor then dig.
Dig so that you can take at least one thickness of chicken wire a foot down into the earth, then a foot horizontally outwards and then cover back with soil. Reynard will have a few attempts at getting in, and hit wire. After a while they will give up (and teach their cubs that it is a pointless exercise).
On foxes: