The Queen had decided earlier that she would not add to the three dogs she already owns over fears they may trip her and concerns over what would happen to them if something were to happen to 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 Mr Fenwick's health was ailing, the Queen, 91, would often take his dogs for walks around the Sandringham grounds. She continued the walks after his death.
Mr Fenwick'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.
The Queen, a notable lover of corgis, is also the proud owner of another corgi, Willow, and two dorgis, Vulcan and Candy.
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