Rick - Well, one time I accidentally "pruned" a rose with a weedwacker, but I wouldn't recommend that method to be honest. Can you take a pic of it? I'd go inside the bush & cut about 1/4 of the canes down to the dirt if there's a ton of canes (10+), the rest I'd prune about 1/3 - 1/2 down depending on size. Make sure that you wear long sleeves & your pruners are VERY SHARP. I'd also have some bleach wipes handy, too, just in case.
