Whether cats should be kept indoors or allowed outdoor access is one of the most debated questions in companion animal welfare. The evidence reveals genuine trade-offs on both sides.
The indoor vs outdoor debate involves genuine welfare trade-offs. Outdoor access satisfies natural behaviours — hunting, exploration, territorial patrol, social interactions — and is associated with lower rates of some behaviour problems. But the mortality and morbidity costs are real and substantial. The conservation harm to wildlife populations, particularly birds and small mammals, adds an ethical dimension beyond the individual cat. Context matters enormously: a cat in a rural area with low traffic and no wildlife sensitivity zones faces different risks than an urban cat on a busy road. Managed outdoor access — secure gardens, cat-proof fencing, leash training, or enclosed catios — represents a growing middle ground that can deliver behavioural benefits while reducing mortality and conservation harm.