He stayed by his side, right till the end.
Sully, George HW Bush's service dog, had been keeping watch by his master's casket since he died aged 94 at home last Friday (Nov 30).
And as Americans paid their last respects to the former US president at the state funeral held at the US Capitol, the three-year-old Labrador retriever bade a final farewell to his master.
Towards the end of his life, Bush battled with Parkinson's disease. Sully helped him with tasks such as retrieving dropped items, opening and closing doors, pushing the emergency button, and supporting him when he stood.