I would suggest a single run of wire along the top of the fence. Also concider a single run of electric wire at the bottom, it will go some way to deter digging and may be help putting them off trying to climb the fence, they're pretty nimble.
Ill be honest if they want to get in, they probably will, but deterrents are always a god idea and by no means a waste of time; will be interested to see other suggestions.