https://cdnph.upi.com/ph/st/th/4461781193593/2026/upi/932414ee9539b90e253d6f258b100b58/v1.5/Brad-Pitt-his-dog-survive-wilderness-in-Heart-of-the-Beast-trailer.jpg" /> "Heart of the Beast," a new film starring Brad Pitt as a Special Forces veteran with a beloved combat dog, opens in theaters in September.