Whether cats should be kept indoors or allowed outdoor access is debated among welfare advocates, conservationists, and cat owners. The evidence is more nuanced than either camp acknowledges.
The indoor-outdoor debate requires balancing individual cat welfare against wildlife welfare and safety. A fully indoor cat without adequate enrichment is welfare-compromised — boredom, obesity, and frustration are documented outcomes. An outdoor cat in an area with heavy traffic, predators, or disease vectors faces serious welfare risks and kills wildlife. The welfare-optimal solution for most cats in urban and suburban environments is enriched indoor keeping with outdoor access via a catio or supervised garden time — this eliminates safety risks and wildlife predation while providing the physical and cognitive stimulation cats need. Rural cats on farms or smallholdings have different welfare contexts that may justify different conclusions.