Abigail Ogle, an Oklahoma City local news anchor, tweeted: "Sully, the service dog of President George H.W. Bush, keeping watch over his best friend". 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.
Bush died at 94 on Friday. The casket was flown in from Ellington Field Joint Reserve Base, a Texas Air National Guard base, aboard an aircraft that often serves as Air Force One.
He will lie in state at the Capitol through Wednesday.
Mr Bush, who served as the 41st U.S. president between 1989 and 1993, died late on Friday at the age of 94. This website is not intended for users located within the European Economic Area.
Shortly before leaving the service, he married his 19-year-old sweetheart, Barbara Pierce, and forged the longest presidential marriage in USA history.
McGrath and the presidential library didn't immediately respond to requests for comment. His death also reduces membership in the exclusive ex-presidents' club to four: Jimmy Carter, Bill Clinton, George W. Bush and Barack Obama.
Many spoke of Bush's role in a bygone era of bipartisan civility in USA politics, a sharp contrast to today's bitter divisions in the age of President Donald Trump, a fellow Republican. The crew has been tasked by Trump with carrying out "Special Air Mission 41".
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Wreaths were placed at the casket by congressional leaders from both parties, as the Bush family, including former President George W. Bush looked on.
The photo, posted initially by Bush's son George, shows the yellow lab slumped by Bush's casket.
The high court will be closed on Wednesday in recognition of the national day of mourning, rescheduling that day's oral arguments over Gamble v.
Bush was president from 1989 to 1993.
He will be honored during several public and private events in Houston and Washington before his burial Thursday in Texas. The detail, made up of agents who enjoyed a close relationship with the former President, will be with him until he is interred and in the second vehicle in the motorcades that will lead to all the ceremonies.
"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".