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WASHINGTON, : US President George W. Bush arrives back at the White House from a weekend spent at the Camp David Presidential retreat with pets Spot (front) and Barney (rear) 20 October, 2002 on the South Lawn of the White House in Washington, DC. AFP PHOTO / TIM SLOAN (Photo credit should read TIM SLOAN/AFP via Getty Images)

WASHINGTON, :  US President George W. Bush arrives back at the White House from a weekend spent at the Camp David Presidential retreat with pets Spot  (front) and Barney (rear) 20 October, 2002 on the South Lawn of the White House in Washington, DC.    AFP PHOTO / TIM SLOAN (Photo credit should read TIM SLOAN/AFP via Getty Images)