Solutions?

Anyone know any good solutions for keeping my couches clean? Kelly likes the dogs on the couch and I like them to not get the couches dirty. I would much rather have no dogs on the couch ever, under any circumstances, but I'm willing to concede that most of the time. In the meantime, my couches are dirty...and I don't want to vacuum (or shampoo, which is what they really need) every day. Anyone have a magic wand?