My young golden Excel was super quick to learn stay. He'd lay down on his station or on the ground at my feet and stay there – all while staring at me intensely.
If I ignored him, he'd sigh loudly or flip onto his hip or put his chin on the ground. I remember how he would purposely look away from me, with his eyes rolled toward me to see if I was going to give him a treat. Or he'd look away and snap his head back toward me in anticipation of the reward. He was offering all the relaxation behaviors I spent months rewarding him for in an attempt to train a relaxed down stay.
Instead of a calm dog I had a dog that was constantly working, offering behaviors, and seeking reinforcement. Not the picture I wanted.