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Home and environment9 min readUpdated on August 5, 2026

Litter boxes: how many, where to put them and how to manage them

The number, placement, size and hygiene of the litter box matter as much as the type of litter. Here is how to set up litter boxes from the cat's point of view.

Audience
Pet owners
Species
Cat
Scope
Valid everywhere

The litter box is one of the most important resources in a cat's home, yet it is often decided based on what suits people: tucked into a corner of the bathroom, small to take up little space, covered to contain smells, single even when there are several cats. From the cat's point of view, though, many of these choices create problems. A cat chooses where to eliminate based on safety, accessibility, space and cleanliness, and when the box does not meet these criteria the message comes across as clearly as possible: outside the tray. Before even thinking about the type of litter, what matters is the number of boxes, their placement, the size and above all the frequency of cleaning. Setting up these resources well prevents most elimination problems and improves the cat's daily wellbeing, and it costs neither the money nor the space people imagine.

How many litter boxes you really need

The most common mistake in multi cat homes is a single box for everyone. Cats have a complex relationship with sharing resources, and one tray can become a point of tension, as well as getting dirty faster. The most widely used rule of thumb suggests one box per cat plus one spare, spread around different parts of the home and not lined up side by side, because two boxes next to each other count almost as one in the cat's eyes.

The number is not a matter of tidiness but a form of prevention. More options mean less competition between cats living together, less chance that a dirty box remains the only one available, and more freedom to choose the right spot at any moment. Even with a single cat, a second box in another part of the home offers a useful alternative, especially in a place over several floors.

Where to place them: the cat's point of view

Placement matters as much as number. A cat eliminates willingly where it feels safe, where it can see the surroundings and any exits, and where nothing disturbs it at its most vulnerable moment. A badly placed box gets avoided even if it is clean and holds the right litter.

  • In a quiet spot, away from sudden noises like the washing machine or boiler, which can startle the cat while it uses it.
  • Not in a dead end: the cat prefers to keep an eye on the surroundings and have a way out, not to feel trapped.
  • Away from the water and food bowls, because cats tend not to eliminate where they eat.
  • Easy to reach, avoiding the cat having to pass another animal or cross a busy thoroughfare to get there.
  • Reachable without jumps or stairs for kittens, senior cats or those with joint pain, who otherwise give up and look for an easier spot.
  • In a stable position, without moving it constantly: changing the location often confuses the cat and can drive it to seek alternatives.

Size, shape and cover

Many boxes on sale are smaller than a cat would like, designed to take up little room rather than to be comfortable. The physical features of the tray influence how willingly the cat uses it, and some choices made for people's convenience work against the cat.

Box features from the cat's point of view
FeatureWhat the cat prefersWhy
SizeLarge, room to turn and dig comfortablySmall trays confine and discourage use
EdgesLow for kittens and seniors, higher only if containment is neededHigh edges hinder those who struggle to climb over
CoverMany cats prefer an open boxThe cover traps smells and limits the view and the exit
Amount of litterA layer deep enough to dig and coverToo little litter does not allow burying
Flap or doorNo obstacle at the entrance, in many casesFlaps and curtains can put off more wary cats

No feature applies to every cat the same way: some tolerate a cover well, others reject it. The best way to discover your cat's preferences is to offer different options and watch which it uses most, instead of deciding based on what looks tidiest in the home.

Hygiene: the variable that matters most

If one thing makes the difference, it is cleanliness. Cats are very attentive to hygiene, and a dirty box is one of the most frequent reasons they stop using it. Daily management matters more than the type of litter and more than any added fragrance, which many cats actually dislike.

  1. Remove waste every day

    Daily removal of faeces and urine is the basis. A box cleaned several times a day, where possible, is better still, especially with more than one cat.

  2. Empty and wash at regular intervals

    Beyond daily scooping, the box should be emptied completely and washed regularly, using mild detergents and rinsing well so as not to leave smells the cat dislikes.

  3. Avoid strong fragrances

    Heavily scented litters and deodorisers can bother the cat's sense of smell and drive it away. Better to rely on frequent cleaning than on masking odours.

  4. Keep the type of litter consistent

    Once you find a litter the cat likes, avoid frequent sudden changes, which can lead it to reject the box. If a change is needed, make it gradual.

  5. Do not use harsh cleaners

    Some products leave residues or smells the cat associates with something to avoid. Always check that the cleaners used are suitable and well rinsed.

  6. Watch what you find in the box

    The box is also a source of health information: changes in the amount of urine, in the faeces or in the frequency are signals to report to the vet.

When the problem is not the box

Setting up the boxes well prevents many problems, but not all. When a cat eliminates outside the box despite number, placement and hygiene being right, the cause may lie elsewhere, and in that case continuing to work only on the environment is not enough.

  • A health problem, in particular of the urinary tract, can make elimination painful and push the cat to avoid the box: this should be ruled out first with the vet.
  • Stress and changes at home, such as a move, a new animal or a disrupted routine, can show up as elimination in the wrong place.
  • Urine marking is a different behaviour from elimination and has its own causes and management.
  • A bad experience linked to the box, such as a fright while using it, can lead the cat to avoid it.
  • In multi cat homes, tensions that are not obvious can limit one cat's access to the resources.

Faced with a cat that eliminates outside the box, the first step is always to rule out a health problem with the vet, because working only on the environment while a clinical cause exists delays the treatment. Once medical causes are ruled out, you work together on environment and behaviour, which are two sides of the same problem.

Frequently asked questions

How many litter boxes do two cats need?
The most widely used rule of thumb suggests one box per cat plus one spare, so three for two cats, spread across different parts of the home and not lined up side by side. It is not a magic number but a way to reduce competition, avoid a dirty box remaining the only one available and give each cat a reachable option at all times. If space is limited, prioritise spreading them across different areas rather than piling several boxes in the same corner.
Open or covered box: which is better?
It depends on the cat, but many prefer an open box. The cover traps smells inside, unpleasant for the cat's sensitive nose, and limits the view and the sense of an exit, which matter to an animal attentive to safety. Some cats tolerate a cover well, others reject it: the best way to find out is to offer both options and watch which the cat uses more, rather than choosing based on what is most discreet in the home.
How often should the box be cleaned?
Waste should be removed every day, and several times a day where possible, especially with more than one cat. Beyond daily scooping, the box should be emptied completely and washed at regular intervals with mild, well rinsed detergents. Hygiene is the variable that matters most: a dirty box is one of the most frequent reasons a cat stops using it. A reminder helps you not skip the cleaning and, as a bonus, not miss the changes that flag a health problem.
My cat goes outside the box even though it is clean: why?
When number, placement and hygiene are right but the cat still goes outside, the cause is often no longer the box. The first step is to rule out a health problem with the vet, in particular of the urinary tract, because painful elimination pushes the cat to avoid the box. Stress, changes at home and tensions between cats living together should also be considered. Continuing to change only the environment while a medical or behavioural cause exists does not solve the problem: it needs to be tackled at the root with the vet's help.

What to do next

Set up one box per cat plus one spare, spread across different areas of the home and not side by side, and choose large boxes that in many cases are open and reachable by kittens and senior cats too. Above all, attend to hygiene, with daily scooping and regular washing without harsh fragrances, and use a reminder so you do not skip it. If the cat goes outside despite everything being right, rule out a health problem with the vet first and then work on environment and behaviour together.

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Litter boxes: how many, where to put them and how to manage them · Animiyo