This paper reflects on the design of a multispecies world centered around a custom enclosure where three cats and a robot arm coexist for six hours a day during a twelve-day installation as part of an artist-led project. The project, named Cat Royale, explores the design of a domestic robot to enrich the lives of cats through play. The authors present the design process, which includes various interconnected components such as the cats, the robot and its autonomous systems, custom end-effectors, and the roles of humans-in-the-loop. They highlight the importance of designing the 'world' in which the technology operates, not just the technology itself. The paper also discusses key moments during the deployment and provides insights into the design implications for future multispecies systems. Specifically, it emphasizes the necessity of human involvement in areas such as breakdown recovery, animal welfare, and audience engagement. The authors argue that designing robots for companion animals requires careful consideration of inter-species interactions and the broader ecology within which the technology exists.This paper reflects on the design of a multispecies world centered around a custom enclosure where three cats and a robot arm coexist for six hours a day during a twelve-day installation as part of an artist-led project. The project, named Cat Royale, explores the design of a domestic robot to enrich the lives of cats through play. The authors present the design process, which includes various interconnected components such as the cats, the robot and its autonomous systems, custom end-effectors, and the roles of humans-in-the-loop. They highlight the importance of designing the 'world' in which the technology operates, not just the technology itself. The paper also discusses key moments during the deployment and provides insights into the design implications for future multispecies systems. Specifically, it emphasizes the necessity of human involvement in areas such as breakdown recovery, animal welfare, and audience engagement. The authors argue that designing robots for companion animals requires careful consideration of inter-species interactions and the broader ecology within which the technology exists.