The Stegosaurus is classified as a limited uncommon pet in Adopt Me! that was released along with the Fossil Egg on October 10, 2020. It hatches from the Fossil Egg, which costs 750. Players have a 30% chance of hatching an uncommon pet from the Fossil Egg. The release of this pet was confirmed through the Fossil Isle Excavation Event, which began on October 2, 2020.