Outdoor cat access creates a fundamental welfare conflict between individual cat enrichment and the welfare of the billions of birds and small mammals that outdoor cats kill annually.
The outdoor cat welfare conflict is genuine and unresolved. From an individual cat welfare perspective, outdoor access provides enrichment through exploration, hunting behavior, and novel sensory experience that indoor environments cannot fully replicate. From a wildlife welfare perspective, outdoor cats cause enormous predation mortality — an aggregate welfare harm to billions of individual wild animals annually. The resolution requires acknowledging both welfare interests. Keeping cats exclusively indoors eliminates wildlife predation risk and dramatically extends cat lifespan, but may compromise individual welfare if adequate indoor enrichment is not provided. Catios and supervised outdoor access provide middle-ground solutions that partially address both welfare concerns. The scale of wildlife mortality from outdoor cats makes this one of the highest-impact cat welfare decisions available to individual owners.