Dog takes subway for 4 years, everyone is shocked when they know the reason

Dog takes subway for 4 years, everyone is shocked when they know the reason
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Armin is an ordinary man, living a life that doesn't change much every day.
He always drives to work, until one day, when his car needs to be repaired, Armin decides to use the subway.
That morning, he got on the train with the crowd, and happened to come across a very special passenger - a small dog with shaggy brown fur, sitting among the commuters with a calm expression on his face as if this was what he did every day.
The dog patiently waited for the train to stop, then quickly jumped onto a train car.
No one seemed to care, it seemed like they were used to its presence.
But Armin couldn't take his eyes off the dog.
He wondered: "Where is its owner? Where is it going?" These questions haunted Armin's mind throughout the long workday.
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