According to the Hollywood Reporter, the film follows a man who loses his wife's dog after a wedding in the Rocky Mountains and who then searches for the dog with the help of the wedding guests. Academy Award nominee Kasdan ("The Big Chill," "The Accidental Tourist") co-wrote the screenplay with his wife Meg Kasdan.

Keaton, an Oscar winner for "Annie Hall," appeared on Broadway in Play It Again, Sam and Hair. Kline won Tonys for The Pirates of Penzance and On the Twentieth Century and an Oscar for "A Fish Called Wanda." Wiest, who holds Oscars for "Bullets Over Broadway" and "Hannah and Her Sisters," recently appeared in The Forest and The Seagull for Classic Stage Company and on Broadway in All My Sons, and will be seen in the upcoming film version of "Rabbit Hole."

Actor-playwright Shepard won the Pulitzer Prize for his play Buried Child and has also written A Lie of the Mind, The Curse of the Starving Class and True West. As an actor, he was nominated for an Oscar for "The Right Stuff" and an Emmy for "Dash and Lilly." Moss, an Emmy nominee for her work on "Mad Men," appeared on Broadway in Speed-the-Plow. Jenkins, the former artistic director of Trinity Rep in Providence, where he acted in and directed numerous productions, was Oscar-nominated for "The Visitor."

"Darling Companion" will begin filming shortly in Utah.