The service dog named Sully — who was a constant companion of former President George H.W. Bush’s during his final months on this earth — was honored by Bush family spokesman Jim McGrath on Sunday night.

McGrath tweeted out a picture of Sully (shown above left) lying right near the former president’s flag-draped casket and wrote these words: “Mission complete.”

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Sully’s Instagram page — yes, the dog had his own account — showed the same photo.

Former President George W. Bush later put the same touching photo on his own Instagram account and wrote, “As much as our family is going to miss this dog, we’re comforted to know he’ll bring the same joy to his new home, Walter Reed,” referring to the military hospital in Bethesda, Maryland.

The yellow Labrador retriever had been with Bush 41 since June of this year.

America’s VetDogs, a nonprofit that provides service dogs, trained Sully.

The pup was named after Chesley “Sully” Sullenberger III, the pilot who made a stunning and safe landing on the Hudson River in 2009.

“A great joy to welcome home the newest member of our family, ‘Sully,’ a beautiful — and beautifully trained — lab from @AmericasVetDogs,” Bush 41 wrote on Twitter back in June. “Could not be more grateful, especially for their commitment to our veterans.”

Bush aide Evan Sisley, at the time, said the dog could open doors, pick up items and summon help, but that “more than anything else, the dog will be a wonderful companion,” as Fox News noted.

President Donald Trump has set aside this Wednesday, December 5, as a national day of mourning for the former president.

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The burial of George H.W. Bush is set for Thursday at the Bush Library Center.

Bush passed away on Friday night at home in Houston at the age of 94.

Related: George Herbert Walker Bush, Rest in Peace

He is survived by five children, including former President George W. Bush and former Florida Gov. Jeb Bush. A sixth child died in early childhood.

The late former president also is survived by 17 grandchildren.

After graduating high school on his 18th birthday, Bush 41 enlisted in the U.S. Navy. He was commissioned that same year, becoming the youngest pilot ever to serve in the Navy, and flew 58 combat missions in the Pacific.

In 1944, he was hit by anti-aircraft fire some 600 miles south of Japan but managed to bail out.

He was awarded the Distinguished Flying Cross and three Air Medals.

On Jan. 6, 1945, a 20-year-old Bush married 19-year-old Barbara Pierce of Rye, New York, whom he had met at a Christmas party three years earlier.

They had four sons, George, Jeb, Neil and Marvin, and two daughters, Robin and Dorothy. Robin died of leukemia at age 3.

After World War II, the future president enrolled at Yale University, where his first son, George W., was born.

Bush graduated Phi Beta Kappa with a degree in economics and was captain of the varsity baseball team.

He and Barbara moved to Texas, where he worked in the oil business and was elected to two terms in the U.S. House of Representatives. After losing a Senate campaign in 1970, Bush was appointed to a number of high-level political positions: U.S. Ambassador to the United Nations, chairman of the Republican National Committee, chief of the U.S. Liaison Office in Beijing, and director of the Central Intelligence Agency, as Fox News noted.

In 1980 he was elected to the first of two terms as Ronald Reagan’s vice president and in 1988 was nominated by the Republicans to carry the party’s banner, with Sen. Dan Quayle of Indiana as his running mate, in that year’s presidential election.

On the judicial front, Bush made two Supreme Court appointments during his years in the White House, David Souter in 1990 and Clarence Thomas in 1991.

Former President George W. Bush issued the following statement upon his father’s death: “Jeb, Neil, Marvin, Doro, and I are saddened to announce that after 94 remarkable years, our dear Dad has died. George H.W. Bush was a man of the highest character and the best dad a son or daughter could ask for. The entire Bush family is deeply grateful for 41’s life and love, for the compassion of those who have cared and prayed for Dad, and for the condolences of our friends and fellow citizens.”

“Through his essential authenticity, disarming wit, and unwavering commitment to faith, family, and country, President Bush inspired generations of his fellow Americans to public service.”

President Donald Trump and first lady Melania Trump also issued a statement about the passing of the 41st president, saying, in part, “Through his essential authenticity, disarming wit, and unwavering commitment to faith, family, and country, President Bush inspired generations of his fellow Americans to public service.”

The body of the former president is being transported by a motorcade on Monday morning from a Houston funeral home to Ellington Field Joint Reserve Base, a Texas Air National Guard base.

The casket then will be loaded onto a plane and flown to Joint Base Andrews in Maryland, according to officials, as Fox News also noted.

Former first lady Michelle Obama announced on Sunday that in order to attend Bush’s funeral this week, she would be canceling her planned book tour appearances in Paris and Berlin.

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