Maybe you can list signals that indicate dogs don't like a behavior?
1. Lip Licking, nose licking - especially if a dog doesn't like what you are about to do, or doesn't understand what you want or are going to do, or are giving confusing cues/behaviors.
2. Looking away - especially if you are staring at the dog ... as opposed to just looking at the dog and smiling.
3. Yawning - similar to #1 above, AND if you are currently doing something the dog doesn't like. Dogs may yawn when hugged, yelled at, jerked with the leash, patted on the head or body rather than rubbed.
4. Shaking it off - this is similar to shaking water off, but performed with no water around. It may indicate that a dog didn't like the most recent behavior.
5. ... Many dogs do not like their feet or the tops of their feet touched. They don't like their tails touched or pulled. They don't like you to touch or tickle under their tail or their ears ... (They Do like their ears scratched and rubbed.)
6. They don't like to be yelled at. Most dogs can easily learn to listen to a whisper, and I've had dogs learn to 'read lips'.
7. They don't like to be loomed over, to be laid on top of, to be stood over.