It would be a good opportunity to give your dog some attack training 
Tempting, but then they'd shriek and howl about being "Assaulted" and "Victimized," and demand that you be jailed and the dog put down.
I'd instead (If I could tell in advance they were coming) get some water balloons ready, perhaps with the water treated with some kind of colorful dye that'll be hard to wash out.