The Cy-Fair Volunteer Fire Department says Bretagne (pronounced Britney) was a founding canine member of its search and rescue team in 2000.
She joined members of Texas Task Force One to search for people in the rubble of the World Trade Center, later responding to disasters like Hurricanes Katrina and Rita.
Even Governor Abbot tonight thanked Bretagne for her service in a tweet.
The last living 9/11 rescue dog has passed away. Texas & America are forever grateful for Bretagne's servicehttps://t.co/w8uFJDiMuk— Gov. Greg Abbott (@GovAbbott) June 7, 2016
Bretagne had an epic last birthday party in September.
PHOTOS: Bretagne the rescue dog's best day ever