Departing from Texas with a 21-gun salute, George HW Bush's casket was carried to Joint Base Andrews outside the Washington aboard an aircraft that often serves as Air Force One, and it was designated "Special Air Mission 41" in honour of Mr Bush.
The dog sat before Bush's casket for several moments with a handler before lying down near other mourners.
A Connecticut Yankee from a wealthy family who moved to Texas to be an oilman, Bush has been eulogized as a president with a keen sense of civility and duty. He will be laid to rest alongside his wife of 73 years, Barbara, who died earlier this year, and their daughter, Robin, who succumbed to leukemia in childhood. And President Bush was a bipartisan president.
There will be a national day of mourning Wednesday to honor the late former President George H.W. Bush, who died Friday night at 94.
Arizona Gov. Doug Ducey, who will attend the funeral in Washington, D.C., has ordered flags on state buildings to be flown at half-staff. "He had an enormous capacity to give of himself".
As the 72-year-old Bush arrived at the National Cathedral for the state funeral for his father - the 41st USA president - he shook hands with President Donald Trump and his wife, Melania. The pair quickly bonded, with the former president even buying socks in honor of his beloved companion.
President Donald Trump had no speaking role during the Episcopalian service, a break from recent tradition and in accordance with George H.W. Bush's wishes.
Regular mail will not be delivered. She and her husband, Prince Philip, also visited Bush and his wife, Barbara, when their son was in the White House in 2007. The Trumps visited Bush's casket Monday evening.
Federal departments and agencies will be closed Wednesday as well, including the U.S. Postal Service.
But Trump wrote members of Congress to hail Bush as a man who "led a life that exemplified what is truly great about America. The Prince will be representing Her Majesty The Queen".
Firefighters rehearse putting an American flag on an overpass above the rail lines where Union Pacific No. 4141 will be bearing the coffin of President George H.W. Bush on December 05, 2018 in Tomball, Texas.