We've had a horrid fox problem, I mean hes like a pet (he used to come around all the time, we've decided him being a him by ... well we called it a him XD) so we dont REALLY want to kill him, but if the oppurtunity comes up... (one hasnt yet)
We put up some good deer netting, lock up everything at night, and so far he hasnt dug. If he digs then i dont know how to help you XD