A nearby Styracosaurus, Forrest Woodbush ( Peter Sohn), also impressed with the caveboy's physical prowess, tries to call him by name, but he only responds to Arlo, who names him "Spot." After traveling together for the rest of the day, Arlo laments about his lost family, and confides in Spot, who reveals that his own mother and father are dead. The caveboy leads Arlo to a berry tree, where they are both attacked by a snake, which the caveboy fights and repels, which amazes Arlo. The caveboy finds him and eventually gives him some berries to eat. Waking up, Arlo is dismayed to find himself far from home and tries to survive on his own with minimal success. After spotting the caveboy inside the silo, Arlo chases him in a fit of rage, the both of them falling into a river where Arlo hits his head on a boulder and is knocked unconscious.
Without Henry, Arlo must help Ida with harvesting crops before the first snow. Henry only manages to save Arlo before he is swept away and killed.
After Arlo injures himself, Henry decides to turn back just as a flash flood occurs and a massive rapid appears. Heavily disappointed, Henry forces Arlo to accompany him to track the caveboy through a ravine, where it begins to rain. One day, a trap manages to capture a feral caveboy, but Arlo is too reluctant to kill it and it runs free. In order to give Arlo a sense of purpose, Henry puts him in charge of guarding their silo for pests and helping him set up traps. As the children grow, Libby and Buck easily adjust to life and their responsibilities on the farm (signified by a mud print on a corn silo), but Arlo's timid, cowardly nature makes his tasks difficult for him. In an alternate timeline set millions of years after the asteroid that would have caused the extinction of the dinosaurs passes safely over Earth, two apatosaurus farmers, Henry (Jeffrey Wright) and Ida ( Frances McDormand), give birth to three children: Libby (Maleah Padilla), Buck (Marcus Scribner), and the runt, Arlo ( Raymond Ochoa). While traveling through a harsh and mysterious landscape, Arlo learns the power of confronting his fears and discovers what he is truly capable of.” ―Official website “ The Good Dinosaur asks the question: What if the asteroid that forever changed life on Earth missed the planet completely and giant dinosaurs never became extinct? Pixar Animation Studios takes you on an epic journey into the world of dinosaurs where an Apatosaurus named Arlo makes an unlikely human friend.