FRIDAY the 13th is supposed to mean bad luck — but not for one lucky pet owner.

A seven-year-old Himalayan cat missing since Friday, August 13, 2005, was reunited with his owner almost three years later - with the help of Facebook.

An RSPCA inspector found Jacob the cat in Claymore, south-western Sydney, recently and took him to the Yagoona animal shelter. A microchip scan revealed the owner's name, Maria Zissis, but her phone had since been disconnected.