Cat litter and litter boxes: the mistakes to avoid before buying

Litter is the first source of conflict between a cat and a household. The vast majority of out-of-box accidents are neither spite nor stubbornness: they signal a box that is too small, too dirty, badly placed, or a medical problem. Getting the container and the substrate right solves a large share of cases before behavioural treatment is even considered.

Box size is criterion number one, and the most frequently ignored. A cat should be able to turn around completely and dig without touching the walls: the usual rule is a length about one and a half times the body, tail excluded. Most boxes sold in supermarkets are too short for an adult cat, which pushes the animal to stand on the rim and urinate over the edge.

The number of boxes counts as much as their size. The accepted rule is one box per cat plus one, spread across different locations. Two boxes side by side count as one in the cat's mind: what matters is having a reachable alternative if another cat blocks the way or a sudden noise makes one spot uncomfortable.

Open or covered depends on the animal. A covered box contains scatter and limits odour spreading through the room, which suits the human. In exchange it concentrates smell inside and removes the view of the surroundings, which some cats refuse — especially in multi-cat homes where a single exit can be blocked. A swinging flap adds one more constraint; remove it at the first sign of hesitation.

Material decides lifespan and cleaning. Plastic scratches with use, and every scratch holds urine: after a year or two the smell persists even after washing. Stainless steel does not scratch the same way, does not stain, does not hold odour and survives vigorous cleaning. It is heavier and noisier when a cat digs, but it is a purchase you do not repeat every two years.

The KISENG XL stainless box with lid answers the common case of a large cat who digs hard: the length prevents overshooting, the lid contains flying granules, and steel washes clean without keeping a trace. The enclosed Suzzipaws XL pushes the same logic with generous volume, useful when the box has to live in a room you actually use and odour control comes first.

On substrate, clay-based clumping litter remains the reference for a precise reason: it lets you lift urine out as a solid block every day, refreshing the box without emptying it. Arm & Hammer Clump & Seal Platinum, in the 18 lb format, relies on firm clump formation and baking-soda odour control; in practice clump firmness is what matters, because a crumbling clump stays at the bottom and spoils the clean litter around it.

Health-monitoring litters are their own category. PrettyLitter, in the 6 lb format, is a crystal substrate that changes colour according to urine parameters, aiming at early detection. Its scope has to be understood: it is a prompt to consult, not a diagnosis. A colour change justifies a call to the vet, never self-treatment.

Litter depth is decided within a couple of centimetres. Too little and the cat hits the bottom, cannot bury, and urine sticks to the pan; too much and the cat sinks, which bothers older animals. Around five centimetres suits most clumping litters; crystals are generally used in a thinner layer, following the maker's instructions.

Cleaning decides acceptance. Daily scooping, topping up the substrate to keep the level, and a full wash with hot water and neutral soap are enough. Perfumed products, bleach and air fresheners are counterproductive: the cat associates the harsh smell with the box and looks for somewhere else, usually a rug.

Switching litter has to be gradual. Changing substrate overnight causes refusals, especially in older cats attached to a texture. Mixing new into old over one or two weeks, raising the proportion steadily, avoids the break. Keeping the old box available during the transition lowers the risk further.

Placement follows three simple principles: away from food bowls, away from traffic and noise, and reachable without obstacles. A utility room where the washer starts in the middle of the night is a poor choice, and so is a box behind a door that closes. For a senior cat, a low entry on one side removes an effort that becomes painful.

One signal is never ambiguous: a cat urinating small amounts repeatedly, vocalising in the box or eliminating right beside it needs a vet without delay. No litter, however well chosen, fixes cystitis or a urinary blockage — and in male cats that last case is a life-threatening emergency.