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I saw a similar thing done with a dog in training to be an assist animal: they put a big bowl of cake and ice cream in front of him, told him he wasn't allowed to have it, and left him alone for an hour. He drooled and drooled, but did not even sniff it.
My (now late and much missed, brilliant) cattledog could be told to leave food alone; he would stare at it unblinking until I was convinced his eyes would dry up like raisins but he wouldn't touch it until told he could. My (current, boneheaded) lab will stare at the forbidden delights for about two minutes before getting a "oh fuck this" look on his face and snarfing down the whole plate.
hahaha! We've trained Sky not to jump up and snap treats out of our hands in such a fashion that we have to count our fingers afterwards. She has to sit, and keep her head still... if she starts straining her head forward, we pull back with the treat and don't give it to her until she doesn't move. She's learned this very well, and adds her own little embellishment: as we're bringing the treat closer to her face, she keeps her head still, but moves her eyes off to the left, like, "la di da, la di da, can't see no treats here, nope, nada, don't see nuthin', not even lookin'." Totally cracks me up.
This only works with us, though. When other people offer her treats when we're out, we're still in finger-counting land.
This is so mean ... I just love the evil grin on the dog's face at the end. He's obviously planning to tear the trainer limb from limb when there's no-one to hear her scream ... :-)