The indoor versus outdoor cat debate requires weighing quantified risk data against behavioral welfare needs — evidence supports enriched indoor living as the welfare-optimal choice.
The outdoor cat welfare question requires balancing individual behavioral welfare against significant risks to the cat and wildlife. The evidence shows that outdoor access, while providing behavioral stimulation, substantially reduces cat lifespan through preventable causes. Enriched indoor environments with vertical space, puzzle feeding, window perches, and interactive play sessions can satisfy behavioral needs that outdoor access would otherwise meet. The welfare-optimal solution for most cats is an enriched indoor environment supplemented with safe outdoor access through catios, leash walks, or garden enclosures — providing enrichment benefits without vehicle, predator, or disease exposure. This approach also eliminates the wildlife predation impact that constitutes a significant negative welfare externality of free-roaming cat lifestyles.