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If the person puts his arrival time in the timer, the furniture's light gradually comes on as the master's arrival time comes. The dog realizes this fact as it repeats and eventually the dog can overcome the fear by understanding the light signal as the arrival of its master. Also because the light is on while master left the house, it gives sight to the dog and decreases the lonelyness.
daegu, South Korea
sang eun park,
kang in lee,