Historians believe Harry S. Truman's folksy aphorism about friends in Washington and dogs is probably apocryphal - the 33rd USA president didn't actually like dogs - but he would surely have fallen for Sully's charms. Bush died late Friday at age 94. He served one term as president, from 1989 to 1993, after a long career in government service.
Former President George H.W. Bush spent much of his life in Texas, but he had strong New England ties.
Not all United States presidents have been fond of dogs though: John F Kennedy was allergic to dogs, and Donald Trump does not have one.
The body of the one-term Republican president will lie in state at the Rotunda through Wednesday, when a state funeral is scheduled at the Washington National Cathedral.
Former US first lady Michelle Obama said she was cancelling book tour visits to Paris and Berlin to attend the "important" funeral and honour Bush's "tremendous contributions to our world".
The White House also issued a presidential proclamation that the American flag will fly half-staff on all public buildings and grounds, military posts, and U.S. embassies around the world for the next 30 days.More news: UEFA to launch third-tier European club competition
Trump and his wife Melania are to attend the funeral at the Washington National Cathedral, as will other former presidents and their wives.
Afterward, Bush will be returned to Houston to lie in repose at St Martin's Episcopal Church before burial on Friday at his family plot on the library grounds.
In Texas, students, staff and visitors have been flocking to Bush's presidential library on the campus of Texas A&M University in College Station.
He will be laid to rest alongside Barbara Bush, his wife of 73 years who died in April, and Robin Bush, the daughter who died of leukemia at age 3. A state funeral is being arranged with all of the accompanying support and honors.
Bush's passing puts him back in the Washington spotlight after more than two decades living the relatively low-key life of a former president.
Baker was a young lawyer in Houston grieving his wife's untimely death when Bush, his tennis partner, persuaded him to try something new: help Bush run for office. The coffin will be flown from Texas to the Capitol on board Air Force One, and then back on Wednesday, and Sully will be there every step of the way. The special honor guard also performed other traditional fanfare including "Four Ruffles and Flourishes" and a 21-gun salute. The president will designate Wednesday, December 5th as a National Day Of Mourning. Write to us in the Comments Section.