For me, my ex boyfriend put some pennies in a can put the lid on it and taped it up, so every time he starts barking or doing something I don't like, I shake the can at him. Since he's afraid of the sound and it only happens when he's barking or doing something wrong, it get's the point across and I don't spank the dog as many people do.
Ceaser will imitate a dogs bite with his hand. If a dog is doing something wrong like barking he make a claw shaped hand and without the doc expecting it grab at it at either the dogs side or neck, not hard, but just enough to get it's attention and startle it. Like another dog would do to it if it was out of control that other dog would bite the one acting up. Also sometimes, if he's walking the dog and it does something and won't listen to the sound he makes or the hand thing he'll take his right foot and bring it behind him to tap the dog on the hiney with it. Again, not hard but just enough to catch it's attention and make it stop obsessing over whatever it's barking at.
