How many litter boxes do I need?

Why the extra box

Eliminating leaves a cat briefly vulnerable, so cats want an option nobody else controls. Where boxes are scarce, one cat can restrict access to them simply by sitting in the doorway, which is far too subtle to look like bullying. The spare guarantees an unguarded choice.

It also absorbs ordinary failures: a box mid-clean, a door shut by accident, a box a cat has decided is contaminated, or a washing machine that started spinning halfway through a visit.

Where they go matters more than how many

• Different rooms, and different floors in a multi-storey home.
• Never next to food and water. Cats will not eat where they eliminate.
• Out of dead-end corners, so a cat can see what is coming and leave in more than one direction.
• Away from noisy appliances and busy hallways.
• One box on the floor a senior cat or a young kitten spends most time on, so nobody has to manage stairs in a hurry.

If the space genuinely is not there

The rule is a target, not a pass mark. Going from one box to two in a two-cat home captures most of the benefit. Where the count is short, scooping frequency compensates in part, because a spotless box gets used when a soiled one does not. Scoop at least daily whatever the number, and replace plastic boxes once the surface is visibly scratched, since scratches hold odour permanently.