The last living search dog deployed to the World Trade Center after 9/11 has died.
Bretagne, a 16-year-old golden retriever, was put down Monday after her health declined. She was saluted by her fellow firefighters with the Cy-Fair Volunteer Fire Department in Houston on her way to the vet's office.
Bretagne was deployed to ground zero after 9/11 and spent 10 days searching for people buried in the rubble. She also responded to several other disasters, including Hurricane Katrina in 2005.
See the heartbreaking tribute she got on her final day:
There is even a cobblestone dedicated to Bretagne and her handler, Denise Corliss, at the National September 11 Memorial and Museum.
Bretagne was retired when she was 10 and spent her remaining years assisting in the training of other search dogs. She also helped first-graders practice their reading skills by letting them read to her.
RELATED: See images of President George W. Bush on 9/11:
Newly-released photos of President Bush on 9/11 (BI)
Last living 9/11 rescue dog honored on her final day
President George W. Bush participates in a reading demonstration on the morning of Tuesday, September 11, 2001, at Emma E. Booker Elementary School in Sarasota, Florida.
President Bush confers with, from left, Karl Rove, Andy Card, Dan Bartlett, and Ari Fleischer before delivering remarks on the World Trade Center disaster from the General Dougherty Conference Center at Barksdale Air Force Base.
After returning to the White House, President Bush meets with, from left, Vice President Dick Cheney), Chief of Staff Andy Card, National Security Adviser Condoleezza Rice, and Special Agent Carl Truscott of the US Secret Service in the President's Emergency Operations Center.