The question of whether cats should be kept indoors, allowed outside, or provided with enclosed outdoor spaces is one of the most contested in companion animal welfare, with implications for both cat and wildlife welfare.
Cat outdoor access creates a genuine welfare triangle: free outdoor access improves behavioral welfare for the individual cat but reduces their lifespan and imposes welfare costs on the wildlife they kill. Full indoor confinement protects both the cat and wildlife but imposes behavioral and cognitive deprivation costs if indoor enrichment is inadequate. The welfare-optimal solution depends on individual cat behavior, local wildlife density, and owner commitment to indoor enrichment. Catios — enclosed outdoor spaces with climbing structures, plants, and weather protection — offer a middle path that provides outdoor stimulation without wildlife risk. Leash training provides another alternative. The least welfare-optimal scenario is inadequate indoor enrichment without outdoor access, producing a psychologically deprived indoor cat. Cat welfare and wildlife welfare are both best served by enriched indoor environments supplemented with safe outdoor access.