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Princess Elizabeth exercising one of her Corgi dogs in London's Hyde Park. (Photo by London Express/Getty Images)

Princess Elizabeth exercising one of her Corgi dogs in London's Hyde Park.   (Photo by London Express/Getty Images)

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July 1936: George, Duke of York and Princess Elizabeth sitting on a bench with their corgi dogs in the grounds of their London home, 145 Piccadilly. (Photo by Lisa Sheridan/Studio Lisa/Getty Images)

July 1936:  George, Duke of York and Princess Elizabeth sitting on a bench with their corgi dogs in the grounds of their London home, 145 Piccadilly.  (Photo by Lisa Sheridan/Studio Lisa/Getty Images)

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July 1936: Princess Elizabeth in the grounds of her London home, 145 Piccadilly, with her pet corgis Jane and Dookie. (Photo by Lisa Sheridan/Studio Lisa/Getty Images)

July 1936:  Princess Elizabeth in the grounds of her London home, 145 Piccadilly, with her pet corgis Jane and Dookie.  (Photo by Lisa Sheridan/Studio Lisa/Getty Images)

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June 1936: Queen Elizabeth II (as Princess Elizabeth) and her younger sister Princess Margaret (1930 - 2002) sitting on the grass in the grounds of the Royal Lodge, Windsor, stroking a corgi. (Photo by Lisa Sheridan/Studio Lisa/Getty Images)

June 1936:  Queen Elizabeth II (as Princess Elizabeth) and her younger sister Princess Margaret (1930 - 2002) sitting on the grass in the grounds of the Royal Lodge, Windsor, stroking a corgi.  (Photo by Lisa Sheridan/Studio Lisa/Getty Images)

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Princess Elizabeth (now Queen Elizabeth II) with two corgi dogs at her home at 145 Piccadilly, London, July 1936. (Photo by Lisa Sheridan/Studio Lisa/Hulton Archive/Getty Images)

Princess Elizabeth (now Queen Elizabeth II) with two corgi dogs at her home at 145 Piccadilly, London, July 1936. (Photo by Lisa Sheridan/Studio Lisa/Hulton Archive/Getty Images)