Jason Biggs and Jenny Mollen -- DOG LOST ... Plea For Help

10:00 AM PST -- The dog has been returned home to its family. Biggs says the woman who put the dog in her car found out Jason was the owner after someone pointed her to their public cry for help.

Jason Biggs and his wife Jenny Mollen are on a feverish hunt for their adorable dog Gina ... who went missing Friday.

Gina somehow slipped away in the hilly Benedict Canyon area of L.A. Someone who says they ID'd the pooch told the couple someone put Gina in a car and drove off.

The dog was last seen in her Halloween costume -- Victor/Victoria. Gina wasn't wearing a collar, but she is microchipped.

If you have any info, contact them on Twitter.