Bush said on Twitter Monday that Sully is a beautiful and beautifully trained golden lab from the America's VetDogs non-profit organization in New York.
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The group provides service dogs to veterans in need.
The former president said he could not be more grateful, especially for the organization's commitment to veterans.
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If you'd like to follow Sully's adventures, he has his very own Instagram account: @SullyHWBush.
WATCH: Presidents and their pets
Happy National Pet Day! Here's presidents and their pets