The Land Before Time: The Great Valley Adventure (1994)

After his tribe of herbivorous dinosaurs moves to the carnivore-free Peaceful Valley, young Littlefoot and his friends chase after a pair of dangerous dinosaurs stealing an egg from the village. While running, they accidentally cause a landslide that opens up their home to outsiders. When the egg they bring back and hatch reveals not one of their own, but a carnivorous tyrannosaurus, the youngsters decide to secretly raise it.