The search for missing Perth woman Mary Nix has continued for the 12th straight day on Saturday.

The search, involving more than 60 State Emergency Services, will focus on the rural area of Bindoon, where police found her abandoned car on Teatree Rd, 70km north of where she was last seen.

The 69-year-old woman was reported missing by her neighbours in Perth's north-east after they realised her dogs weren't being looked after.