Is it cruel to keep a cat indoors only?

No — in most contexts, indoor-only is the safer choice and not unkind, provided the indoor environment meets a cat's needs.

The data is fairly settled: indoor cats live, on average, 10–15 years. Outdoor and indoor/outdoor cats average 2–5 years in many studies, due to traffic, predation, disease, and toxin exposure.

The "cruel" framing comes from the assumption that an indoor cat is bored and unstimulated. That's true for some indoor setups, not all. A well-built indoor environment includes:

- Vertical space: cat trees, shelves, window perches. Cats are arboreal — being able to look DOWN matters
- Hunting outlets: wand toys daily, not just toys "left out". 10 minutes of active play, twice a day, replaces what hunting provides
- Scratching: real surfaces, not just one cardboard pad in a corner. Vertical and horizontal options
- Visual enrichment: windows, ideally with a bird-safe feeder outside (out of paw reach)
- Food puzzles: instead of bowls, sometimes — engages the brain
- Catio or harness training if you have outdoor space and the inclination — bridges indoor safety with outdoor stimulation

Bored indoor cats can develop OCD-like behaviours (over-grooming, food obsession). The fix is environmental enrichment, not letting them outside unsupervised.

Also: cats kept indoors don't kill billions of birds. That matters too.