Fox proofing

[Steve the Chicken]

How far down should I dig my chicken wire in the ground?

 

[nuthatched]

I would recommend hardwarecloth or 2x4 fencing, chickenwire is not remotely predator proof.
Depending on your dirt, a foot, then bury, then pavers.

 

[StinkyAcres]

Agreed - don't use chicken wire. Hardware cloth can either be buried or laid down flat on the ground a foot or more out. If you lay it down on the ground you can cover it with dirt, mulch, or gravel (not pavers/large stones as this defeats the purpose) or you can stake it and let the grass grow through it.