The organization paired Sully with Bush to support the former president in his daily activities - from answering the phone to picking up items.
This group consisted of Donald and Melania Trump, along with past presidents and their spouses.
Dole was helped from his wheelchair in the rotunda to salute the fellow World War II veteran, whom he unsuccessfully challenged for the 1988 Republican presidential nomination.
Trump has said some rather negative things about the Clintons and the Obamas in the past. He will lie in state until Wednesday, when funerary services will take place at the Washington National Cathedral.
George W. Bush greeted Melania Trump with a kiss outside Blair House. In the second row are Vice President Mike Pence, and his wife Karen Pence, former Vice President Dan Quayle, and his wife Marilyn Quayle and former Vice President Dick Cheney and his wife Lynn Cheney, former Vice President Joe Biden and his wife Jill Biden.
"I might have left Air Force One behind", Bush quipped during the 2005 unveiling of 4141, a blue and grey locomotive commissioned in honour of the 41st president and unveiled at Texas A&M University. She and her husband, Prince Philip, also visited Bush and his wife, Barbara, when their son was in the White House in 2007.
"I'm just here to pay my respects", said Jane Hernandez, a retired doctor. The current president has mocked the elder Bush for his "thousand points of light" call to volunteerism, challenged his son's legacy as president and trounced "low-energy" Jeb Bush in the Republican presidential primaries en route to office.
There were chills for sure in Smithtown, where Sully was trained by America's VetDogs.
Union Pacific originally commissioned the Bush locomotive for the opening of an exhibit at his presidential library titled "Trains: Tracks of the Iron Horse".
Trump has ordered the federal government closed Wednesday for a national day of mourning.