[draculero]

I had a dog that yawned to say "no".

I don't know if she trained us or I trained her, but she associated stopping doing something with a yawn.

Don't like petting? yawn and the human will stop.

Don't like that food? yawn and we will change it.

Don't like going to the veterinary? yawn - but that never worked.

I loved that dog.

[bicx]

I think that yawning is also something dogs do when they are frustrated. My dog does it a good bit, and that’s when I know to give her a break. Or maybe I’m just being trained too…

[DANmode]

It's a known anxiety response for dogs.

The hard part is most humans can't connect their own angst with their environmental conditions!