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 or Pet Cove exists, with a safari theme and mountainous landscape. It is unknown if this design was ever implemented as an in-game world.