Washington (CNN) Sully, a yellow Labrador service dog who worked with late former President George H.W. Bush, is accompanying his master one last time by traveling to Washington with Bush's casket.

In a photo tweeted by Jim McGrath, Bush's spokesman, Sully can be seen sitting directly in front of Bush's casket at a Texas funeral home Monday morning, his head bowed in unison with the Bush family members that surround him.

Images from this morning and the state funeral for President George H. W. Bush -- family at the funeral home, @SecretService honorary pallbearers, and boarding "Special Air Mission 41" at Ellington Field. #Remembering41 (Credit: Office of George H.W. Bush-Evan Sisley) pic.twitter.com/T6br9URryZ — Jim McGrath (@jgm41) December 3, 2018

Last night, McGrath shared a photograph of Sully lying next to Bush's casket along with the caption, "Mission complete."

Sully is named after former airline pilot Chesley B. "Sully" Sullenberger III , who became famous for landing a damaged passenger jet on the Hudson River and saving all 155 passengers and crew in 2009.

A highly trained service dog, Sully will now go back into service to help other veterans and is going to Walter Reed National Military Medical Center, former President George W. Bush wrote in an Instagram post.