Darling Companion (2012)

Beth Winter (Diane Keaton), wife of a self-absorbed surgeon named Joseph (Kevin Kline), is decidedly lonely. One day while out driving with her daughter, Grace (Elisabeth Moss), Beth rescues a stray dog and later decides to keep it. The pooch, dubbed Freeway, fills the void in Beth's life, begins to crack Joseph's stern exterior, and acts as a matchmaker for Grace. Then, Joseph loses Freeway while out walking, leading to a frantic search that brings forth long-hidden resentments.