It's often said that if you want a friend in Washington, get a dog.
For the last six months, Sully the service dog was President George H.W. Bush's.
The yellow Labrador Retriever visited the former US President's casket in the Capitol Rotunda today alongside people in wheelchairs who benefited from the Americans With Disabilities Act that Bush signed in 1990.
John Miller, the president and CEO of America's VetDogs, said the Bush family contacted Walter Reed National Military Medical Centre after Barbara Bush died in April. America's VetDogs chose Sully in part for his calm temperament.
"After Mrs Bush's death, general companionship was a big part of Sully's job," Miller said. "One of the things that I think was important to the President was the rest command, where Sully would rest his head on the President's lap."