I am looking for a movie from the 50’s or 60’s that my wife saw as a child. Do not know the name of it only a brief description of what it is about. There is an old man and a dog and a little rich girl wants this dog because he does tricks but the old man will not part with the dog. Eventually, the old man dies and the little girl ends up with the dog. But the dog is unhappy and does nothing for the girl. Eventually, the dog dies and goes up a staircase to heaven where he is reunited with the old man. Any help with this or any clues as to an actor or movie title would be appreciated.