[ScotsGirl]

The fox can fit through stock netting! Chicken wire is the only thing they can't squeeze through and panels need to be 6' high, anything lower and if they want they will jump it.  I don't believe there is a 100% method as foxes are determined. Depends if you have a big problem in your area. Make friends with the local gamekeeper! Works for me 

[Stereo]

One problem with shooting foxes is that a new one will come in. I reckon the foxes in my fields know about the fence and avoid it. Probably wouldn't try it even if the battery had run down or the grass was shorting it because they don't want to get a whack.

Shoot that fox and in a few weeks another one will fill the gap and won't be so cautious. Maybe better the devil you know?