LOS ANGELES: Jennifer Aniston is keen for her beloved white shepherd mix Dolly - which she adopted as a pup in 2006 - to star in a movie. “Jen taught Dolly to sit, shake and roll over in a few hours, so she’s convinced Dolly has the talent – she just needs the right training,” an insider said. “She even tried to get Dolly cast in her current movie, Squirrels to the Nuts. ” Jen and the film’s director, Peter Bogdanovich, are close friends, “but Jen’s so serious about making Dolly a star that she decided to not call in a favor,” added the source.–SS