Depending on what it is 8ft may not do it. If they are irreplaceable, make sure you put a top on it and protect the bottom (skirt, hot wire, etc). Also, any hot wire up high will be hot as ever if grounded.
Boy, grounding makes SUCH a difference and is cheap cheap!
I don't have any of those breeds or I'd help you out.
Also, I have seen coyotes jump over a 4.5 foot fence without touching it, shortly after seeing that (no losses), I got electric netting to enclose my geese pastures. Phew. Makes me sleep a *little* bit easier.