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I put new fencing with concrete gravel boards up on the summer. In 3 places something has made a concerted effort to get under. I've been considering finishing the job and exposing the underside of the boards a little - I've been worrying about the lack of permeability of the boundaries. The cats/foxes go over, but I know we have toads and frogs and I worry about them not being able to roam. I don't think we have hedgehogs in the area, sadly.
The digging is fairly contained though, and only locally destructive in each location.
how do i stop a motherfucking cat/fox/whatever digging under the fence and fucking the garden bed in the process?