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Usually when we do something we do prepare some image of it in our mind before hand. I must take the bin out, mind prepares the body for the task. Perhaps releasing some scent or pheromones to indicate this and the dogs can pick up on that. Similar thing occurs when your having a nightmare and you wake up swetty. The illusion or images have created a reaction in the physical world, and others can detect it. Dog's have a keen sense of smell.
Regards
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