WATCH: Sully the service dog bids farewell to President George HW Bush

Sully, former President George H.W. Bush’s service dog, pays his respect to President Bush as he lie in state at the U.S. Capitol in Washington, Tuesday, Dec. 4, 2018. (AP Photo/Manuel Balce Ceneta)

AP Photo/Manuel Balce Ceneta

Sully, former President George H.W. Bush’s service dog, walks to the Capitol Rotunda to pay respect to President Bush as he lie in state at the U.S. Capitol in Washington, Tuesday, Dec. 4, 2018. (AP Photo/Manuel Balce Ceneta)

AP Photo/Manuel Balce Ceneta

Former Republican President George H.W. Bush, left, and former President Bill Clinton, visiting Bush, pose for a photo with Sully, a yellow Labrador retriever who’ll be Bush’s first service dog at his home in Kennebunkport, Maine, Monday, June 25, 2018. The 94-year-old and his new companion got acquainted Monday at the Bush family compound on the coast of Maine. (Evan F. Sisley/Office of George Bush via AP)

Evan F. Sisley/Office of George Bush via AP

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WASHINGTON – Friends, family and the public have been filing past the casket of former President George H.W. Bush in the Capitol Rotunda since Monday night, but he had a special visitor Tuesday.

Sully, the service dog assigned to the former president for the last six months of his life, came to say his last goodbye.

Days earlier, Jim McGrath, Bush’s spokesman, posted an image that went viral of Sully next to Bush’s casket on Sunday along with the caption, “Mission complete.”

CNN had the video:

NBC News reported that a group of people who benefited from the passage of the American Disabilities Act, signed by Bush in 1990, attended the viewing.