do you keep a squirt bottle of water or canned air or a can of pennies/screws/bolts etc on hand?
Kloe knows when I pick up the squirt bottle she'd better back off from Kylie or she risks the wrath of Mom.
Canned air more $$ of course - just as a last resort if the water doesn't work.
Can of metal items not thrown at the offender just in the general direction. I tried this also for Keegan when she was a puppy to distract her from doing something she shouldn't.