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LONDON, UNITED KINGDOM - MAY 29: Queen Elizabeth II pets Harris, a PAT dog, during a reception for Leonard Cheshire Disability in the State Rooms, St James's Palace on May 29, 2014 in London, England. (Photo by Jonathan Brady - Pool / Getty Images)

LONDON, UNITED KINGDOM - MAY 29: Queen Elizabeth II pets Harris, a PAT dog, during a reception for Leonard Cheshire Disability in the State Rooms, St James's Palace on May 29, 2014 in London, England. (Photo by Jonathan Brady - Pool / Getty Images)