Former President George H.W. Bush's service dog has honored his master with his own tribute in front of the late leader's flag-draped casket.

Bush spokesman Jim McGrath posted a picture Sunday of the yellow Labrador retriever named Sully with the caption, "Mission complete. #Remembering41."

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Sully is from the nonprofit organization America's VetDogs in Smithtown. The group tells News 12 that it was an honor to provide Sully to the 41st president.

Bush died Friday at his home in Houston at 94. He will be honored during several public and private events in Houston and Washington before his burial Thursday in Texas.

VetDogs tells News 12 that Sully will be there through the funeral to comfort the family. Afterward, Sully will return to Smithtown before going on to Walter Reed Medical Facility to help other veterans, as the late president wanted.

VetDogs provides about 130 service dogs to veterans in need each year. The dogs do everything from providing support to those with PTSD, to picking up phones or keys around the house.

Each of the dogs is trained to do what their specific veteran companion needs.

The president had a form of Parkinson's disease, and Sully could open doors, pick up items and summon help through a "get help" button.