The former president leaves behind a long legacy in global politics.
Sully, a yellow Labrador retriever, became Bush's new service dog in June.
Those reflections will continue throughout the week, when Bush's casket travels from Houston, Bush's hometown, to Washington, DC to lie in state in the United States Capitol. Bush will lie in state in the Capitol starting Monday and a service will be held at the Washington National Cathedral later in the week. He said it was going to be a tough week and he looked forward to it being over.
The coffin will be flown from Texas to DC on board Air Force One - temporarily renamed Special Air Mission 41, in homage to the late president - and then back on Wednesday, with Sully accompanying the body throughout. There, he will help wounded veterans and service members during their recovery.
David J. Phillip Pool AP
Bush's personal relationship with his Secret Service details will also be on full display throughout the week of events.
Sully the dog will be travelling with the casket on the flight from Texas to Washington DC on Monday. Bush's son President George W. Bush named Roberts chief justice in 2005.
Bush's death has also led to a series of symbolic moments.
The picture was posted on Twitter by Bush's longtime aide and friend, Jim McGrath.
Both Bush's wife Barbara, the former first lady who died in April, and their daughter Robin, who died of leukemia as a child, are laid to rest on the library's grounds.
Donald Trump and Xi Jinping declare trade truce at G20
Meanwhile, the USA stood alone as the 19 other countries again pledged to implement the Paris accord to fight climate change. Mr Trump has reaffirmed his commitment not to boost tariffs on $200bn of Chinese goods to 25% on 1 January.