How Many Litter Trays Does Your Cat Need? The n+1 Rule Explained
One litter tray per cat, plus one spare. That’s the rule vets and feline behaviourists agree on, usually written as n+1: one cat needs two trays, two cats need three, three cats need four. The spare isn’t a luxury. It’s what keeps a clean, unguarded option available at all times, which is the single cheapest […]