We have a zapper thingy. havent used it in eons though. forgot even what it looked now. but my brothers dog hated it. hed growl when ever he heard something getting sizzled on it LOL

here be one:
http://www.amazon.com/Flowtron-BK-15...7381503&sr=1-1

but theres hundreds of diff bug zapper things out there. try Yahooing/Googling bug zapper an see what you get ^^