So on a few occasions we've put food bags on Eva and Ollie's heads but they are actually relatively intelligent and comprehend it's just former food transportation.
Aryte thought it would be a good idea to put a Taco bell bag on Merlin's head to let him experience the fun smells of burritos.
Unfortunately Merlin's mental capacity can only comprehend his immediate visual world and all hell broke loose. He actually panicked and ran so hard into the wall I was startled.
Suffice to say Aryte learned not to block the challenged dog's field of vision.