From there, a funeral train transports Bush to Texas A&M University in College Station, Texas, the site of the George H.W. Bush Presidential Library and Museum, where he will be laid to rest.
"America's VetDogs is deeply saddened by the loss of President @GeorgeHWBush".
The Bush's family spokesman, Jim McGrath, posted the picture of the yellow Labrador retriever called Sully on Twitter with the caption "Mission complete".
"To be honest, at one point in history, ' he said, "it would not have been exceptional to have a president who obeyed and appreciated the norms of the American system and of the presidency, who was civil, who was kind to people and who rose above petty squabbles".
Bush - only the second president to see his son follow him to the Oval Office - will be honored with four days of services and tributes in Washington and in Texas, where he will be buried on Thursday.
Trump declared December 5, as a National Day of Mourning and called on Americans "to assemble on that day in their respective places of worship to pay homage to the memory of President George H.W. Bush".
From there, a departure ceremony will be held at 10 a.m. on Wednesday before Bush's casket is transferred to the Washington National Cathedral at 11 a.m., where a funeral service will be held for family and friends. He demonstrated that in war, he demonstrated that in peace.
Erdogan takes Saudi prince to task, demands extraditions
Canada has been outspoken on human rights in Saudi Arabia, which has retaliated by breaking off diplomatic relations and vowing to end trade.
Marco Silva: ‘power’ of Merseyside derby win can give Everton confidence boost
We have to play without Hendo, that's all it is. "We won't change our ambition or style of play". Yes, we could have scored... "You can see the style of play is different to a year ago .
UNC reportedly hiring Mack Brown as next coach
Brown, 67, is two years older than new Kansas coach Les Miles but nonetheless going to be tasked with the same kind of challenge. Efforts by CBS Sports to reach Brown and athletic director Bubba Cunningham this morning were unsuccessful.
He died aged 94 in Houston, Texas.
Baker said Bush's last words, in a phone conversation with son George W. Bush, were these: "I love you too".
His time as president was marked by the end of the Cold War and the first Gulf war against Saddam Hussein.
Mr Bush was born in 1924 and was shot down in the Pacific during World War Two. He enlisted in the Navy on his 18th birthday. He then succeeded Reagan for a single term.
Soon after, he reached the height of his political popularity following the liberation of Kuwait, with public approval ratings that are the envy of today's politicians, the USA economy began to sour and voters began to believe that Bush, never a great communicator - something even he acknowledged - was out of touch with ordinary people. He lost his bid for re-election to then-Arkansas Gov. Bill Clinton, who would later become a close friend.