Pet Ranch was a world early in the development of LEGO Universe. Like its successor, Pet Cove, it was a small side world where players learned how to tame pets. The landscape of Pet Ranch featured a large waterfall, which then became a river flowing throughout the world, and an archipelago where Terriers, Cats, and Bunnies could be found and tamed.
Concept art for another version of Pet Ranch exists, with a safari theme and mountainous landscape. It is unknown if this design was ever implemented as an in-game world.