The Queen had decided earlier that she would not add to the three dogs she already owns over fears they could trip her.
But she fell in love with the Corgi, named Whisper, after Bill Fenwick, an ex-Sandringham gamekeeper and owner of the dog, died.
When Fenwick's health was ailing, the Queen, 91, would take his dogs for walks around the Sandringham grounds. She continued the walks after his death.
Bill's wife Nancy, who died two years ago, was the Keeper of the Queen's Corgis and she is now returning the favour.
"But she couldn't resist Whisper and now she has asked Bill's family if she can keep him. The Queen bred Whisper and gave him to Nancy and Bill as a gift. She was very fond of them and they became close friends. Nancy died aged 85 and the Queen went to her funeral," he said.
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