In February 2003 Dolly, the world's first animal cloned from an adult cell, was put down.
Dolly was given a lethal injection after it was found that she had lung disease.
Dolly had lived for six years and had given birth normally to four lambs, however scientists become worried about her health in January 2002 when she was diagnosed with a form of arthritis.
It has not been reported whether her disease is related to the fact that she was a clone but scientists at the Roslin Institute in Edinburgh, where Dolly was cloned, say they will conduct a full post-mortem and report any significant findings.
After the post-mortem Dolly will be preserved and displayed at the National Museum of Scotland in Edinburgh.