What Is This Movie Called?

It’s about a man that enjoys with his new dog he found and then he had to go to work and everytime he leaves the house the dog follows him without the man noticing his dog was following him but when the man went to the train station the dog couldnt enter cuz when he went in, the door closed on him so his dog waited hours in front of the train station til he returns. He was doing this for months and months. Then the man died in his job and the dog stood there waiting in front of the train station and he stood there for months then a random guy passes there every time and he said to the others that that dog stood there in the same spot since months ago so he was taken back home and the man’s wife tried to explain the dog that the man is dead but the dog wouldnt understand. After months passed the dog died.
What this movie called? pls tell me!