Decisions about outdoor access for companion cats involve complex welfare trade-offs between natural behaviour expression and the significant mortality risks of outdoor environments.
The outdoor access welfare decision for cats represents one of the most genuinely difficult trade-offs in companion animal management, because the welfare harms on both sides are real. Outdoor cats can express natural predatory behaviour, patrol territories, engage in complex social interactions with other cats, and have mental stimulation from environmental novelty - all positive welfare contributions. They also face road death, fight injuries, disease from other cats, and in some areas, deliberate poisoning or cruelty. Indoor-only cats are protected from these external harms but may develop stress-related conditions including feline idiopathic cystitis, overgrooming, and obesity if their indoor environment is insufficiently enriched. The welfare answer is therefore not simply 'keep cats indoors' but rather 'provide an environment that meets welfare needs while managing risk.' Controlled outdoor access via catios (enclosed outdoor spaces), garden netting, and supervised outdoor time provides environmental stimulation while managing mortality risk. Night-time curfews reduce road accident risk substantially while allowing daytime outdoor expression. Individual cat personality, local road density, and indoor environment quality all affect the appropriate risk-benefit calculation for individual animals.