Ridley Scott’s film adaptation of Peter Heller’s The Dog Stars makes several major changes to intensify the action and streamline the post-apocalyptic story. Both versions follow Hig, a pilot surviving a pandemic in Colorado with his dog Jasper and armed companion Bangley, but the film reshapes key events surrounding Jasper’s death, Hig’s search for other survivors and the threat posed by hostile outsiders.

In the novel, Hig’s cream-and-blue Cessna is nicknamed The Beast and Jasper dies peacefully while camping; in the film, the dog is killed during an attack after Bangley delays shooting invaders. Hig’s arrival at Cima and Pops’ farm is also altered, with the film introducing Cima first and forcing a hurried escape during a Reaper assault, whereas the book develops their relationship and flight plan more gradually. The book’s hostile group is called “The A-rabs”, while the film renames them the Reapers; the novel’s release also prompted a 268.5% rise in Libby library-app demand during the release week.