How to Litter Train a Kitten: Age, Setup and the First Two Weeks

Litter training a kitten is mostly a matter of not getting in the way. PetMD's veterinarian-written guide notes that most cats naturally seek out a sandy, granular place to eliminate, and young kittens mainly need help working out where that place is. The owner's job is to put that material where a small animal can reach it at the moment it needs it, keep it clean, and avoid teaching the kitten that the box is a place where bad things happen.

The usual obstacles are a box that is too hard to get into, a box that is too far away, and a kitten that was scolded near it. Each of those has a plain fix, and none of them needs a special product.

When a kitten is ready

For the first few weeks of life a kitten cannot eliminate on its own. PetMD's guide to litter training, written by a veterinarian, explains that the mother cat stimulates her kittens to urinate and defecate in those weeks and cleans up after them, so there is no point offering a box yet. The same guide puts the start of litter training at around four weeks of age, which lines up with the start of weaning.

That timing matters mainly to people fostering or raising a litter. Most owners bring a kitten home at eight weeks or later, well past the four-week starting point, so the job is setting up the new home rather than teaching from scratch. An older kitten or an adult cat can start on the household box from the day it arrives.

If you are hand-rearing orphaned kittens younger than about four weeks, this guide is the wrong starting point. Their elimination still depends on a caregiver doing what the mother would, and the routine for that comes from the veterinarian or rescue supervising the litter.

The box: smaller and lower than the one you will end up with

A kitten needs a box it can step into without climbing. Cornell Feline Health Center's house-soiling guidance says young kittens, elderly cats and cats with mobility problems need boxes with low sides. A tall adult box is a wall to a small kitten, and a kitten that has to scramble over a wall in a hurry has every reason to choose the rug instead.

PetMD's guide quotes a certified feline behaviour consultant recommending a tray of around 13 by 9 inches for a kitten, which is roughly the size of a baking dish. That is a starter box. The longer-term figure, from the AAFP and ISFM house-soiling guidelines, is a rectangular box at least one and a half times the cat's length from nose to base of tail. Plan to size up as the kitten grows, and put the full-size box in place well before the kitten is pressing against the walls of the small one.

Uncovered to start. The AAFP and ISFM guidelines say cats are split roughly evenly between preferring a large covered box and an uncovered one, and recommend open boxes wherever possible, because they make it easier to see what is happening and to scoop often. For a kitten that is still learning, an open box is also easier to find and less likely to feel like a trap. The trade-offs for an adult cat are set out in the covered versus uncovered comparison.

Skip the extras. The same guidelines advise against liners, slotted grills and deodorising powders. Cornell says a liner may help keep a box cleaner, but that many cats do not like them. A kitten's claws catch in plastic liners, and a scented powder adds a smell that the kitten has to tolerate rather than seek out.

The litter: unscented, fine, and possibly not clumping yet

The AAFP and ISFM guidelines state that, in most cases, litter should be a fine, sand-like, unscented clumping material at a depth of at least 1.25 inches. Cornell says most cats prefer unscented, finer-textured litter about one to two inches deep. PetMD suggests keeping two to three inches in a kitten's box so there is room to dig. A layer around two inches deep sits inside all three figures for a kitten box, and it can go deeper once the kitten moves to an adult box.

The one difference for very young kittens is clumping. PetMD's guide says kittens younger than 8 to 10 weeks who are just learning to use the box should have non-clumping litter, with a switch to clumping litter once they are older. Its guide gives that as the age line and does not set out a longer explanation, so treat it as the guide's recommendation for that window rather than a rule with a mechanism attached. For a kitten coming home at 10 to 12 weeks, the question is mostly settled already.

Whatever you start with, find out what the breeder or shelter was using and match it for the first couple of weeks. A familiar substrate is one less new thing in a house full of new things. If you do change it later, Cornell's advice for any cat is to switch gradually, mixing small amounts of the new litter into the old. The choice of an adult litter, by dust, tracking and odour, is covered in the litter comparison.

Where the box goes

A kitten has a small bladder, a short warning time and limited knowledge of the house. Location does more of the training than anything else.

Start in one room. For the first days, keep the kitten in a single quiet room with its bed, food, water and box. A small territory means the box is never far away and the kitten learns the routine before it has a whole house to explore.

Away from food and water. The AAFP and ISFM guidelines advise against placing food and water close to the box, because that discourages elimination there. Cornell adds that most cats prefer a box in a spot that is quiet, private, separate from the feeding area and accessible at any hour. In a single starter room, that means opposite corners.

Then more boxes, in more places. Once the kitten has the run of the house, Cornell's guidance is as many boxes as there are cats, plus one, placed in different areas. The AAFP and ISFM guidelines go further and recommend two boxes in two separate locations even in a single-cat household. A kitten on its first trip up the stairs cannot be expected to remember a box two floors down. The placement rules in detail, including the mistakes that cause most adult soiling, are in how many litter boxes, and where.

Leave it where it is. The AAFP and ISFM guidelines say that once a cat starts using a box, it should stay in the same place for at least two weeks, even if the spot is inconvenient. After that, it can be moved gradually, a few inches a day, toward somewhere that suits the household better.

The first two weeks

Show it the box. PetMD's guide suggests showing the kitten each box, letting it sniff, and placing it gently in the litter. Many kittens start pawing at the litter straight away.

Put the kitten in the box at the predictable moments. The same guide suggests placing the kitten in a box after it eats, drinks or wakes from a nap, until it starts going on its own. Those are the times a young kitten is most likely to need to go, and a kitten that happens to be standing in litter at that moment learns quickly.

Reward immediately, or not at all. PetMD advises giving a small treat as the kitten leaves the box, so the reward is tied to the act. A treat handed out a minute later rewards whatever the kitten was doing a minute later.

Scoop more often than you will for an adult. PetMD suggests scooping a learning kitten's box after every use, then moving to daily scooping once the habit is reliable, with a full clean weekly. Cornell notes that some cats refuse a box containing any urine or feces at all. A kitten that finds a dirty box at the wrong moment has an easy alternative right next to it.

Wash it gently. The AAFP and ISFM guidelines say to wash the box every one to four weeks with soap and hot water only, and to avoid strong chemicals and anything ammonia-based. Cornell's cleaning advice is a gentle detergent, then dry and refill.

Accidents, and what not to do about them

Accidents happen with almost every kitten, and the response decides whether they keep happening.

Never punish. Cornell's guidance is blunt: never hit, kick or scream at a cat over house soiling, because the anxiety it causes can make the problem worse. It also says rubbing a cat's face in its mess is ineffective, because cats are not disgusted by their urine and feces and cannot connect the treatment to the act. The AAFP and ISFM guidelines add that punishment tends to damage the bond between cat and owner. For a kitten, the lesson it learns from being scolded beside a puddle is that eliminating in front of a person is dangerous, which leads to hiding rather than to the box.

Clean properly. Cornell says to clean soiled spots soon, with a product that neutralises the odour rather than masking it, and to avoid cleaners containing ammonia or vinegar, because they smell like urine. An enzymatic cleaner is the standard choice. A spot that still smells to the kitten becomes a repeat destination.

Look at the setup, not the kitten. If accidents keep happening in the same place, the kitten is telling you something about access. PetMD suggests checking that every box is easy to reach, in a quiet spot, not hidden in a corner and not guarded by another pet. Putting a box where the accidents happen, then moving it gradually once it is reliably in use, is the same approach Cornell describes for adult cats.

Rule out the medical causes. PetMD's guide recommends a vet visit to check for intestinal parasites, urinary tract infection or other medical problems if training stalls, noting that these are uncommon in kittens but should not be overlooked. Cornell lists digestive problems among the medical causes of litter box trouble, because they can increase urgency and reduce a cat's control over defecation. The first vet visit for a new kitten is a natural moment to raise it, and if a kitten that was trained starts going elsewhere, the steps for a cat that has stopped using the box apply to young cats too.

The setup, in one paragraph

A low-sided, uncovered starter box around 13 by 9 inches, in a quiet corner of a single room, away from the food and water bowls. Around two inches of fine, unscented litter, non-clumping if the kitten is under about 10 weeks, and matched to what the breeder or shelter was using. The kitten placed in the box after meals, drinks and naps, rewarded as it leaves, and never scolded. The box scooped after every use for the first couple of weeks, washed with soap and water, and left in one place. Then more boxes in more rooms as the kitten's territory grows, and a full-size box before it outgrows the small one. Feeding the growing kitten is its own subject, covered in the guide to kitten food.

Questions people actually ask

At what age can a kitten use a litter box?

Around four weeks, according to PetMD's veterinarian-written guide, which is when kittens begin to eliminate without their mother's help and start weaning. A kitten adopted at eight weeks or older can start on the household setup from the first day.

How long does litter training take?

For a kitten that comes home at eight weeks or older, the work is mainly about access and routine in the first couple of weeks. A kitten that is still having regular accidents after that is usually telling you something about the location, the box or its health.

Should a kitten use clumping or non-clumping litter?

PetMD's guide recommends non-clumping litter for kittens younger than 8 to 10 weeks who are just learning, with a switch to clumping once they are older. Whichever you use, choose a fine, unscented litter, which is what the AAFP and ISFM guidelines and Cornell both describe most cats as preferring.

Do I need a special kitten litter box?

You need a box with low sides that a small kitten can walk into. A shallow tray or a low storage container does the job. It will be too small within a few months, so it does not need to be expensive.

Should I punish a kitten for going outside the box?

No. Cornell Feline Health Center says punishment is ineffective and can make house soiling worse, and rubbing a cat's nose in its mess does nothing because cats cannot connect it to the act. Clean the spot with an enzymatic cleaner and look at whether the box is easy enough to reach.

Sources

• PetMD: How to Litter Train a Kitten, written by Jamie Lovejoy, DVM, reviewed by Melissa Witherell, DVM, updated May 13, 2024
• Carney HC, Sadek TP, Curtis TM, et al. AAFP and ISFM Guidelines for Diagnosing and Solving House-Soiling Behavior in Cats. Journal of Feline Medicine and Surgery, 2014, 16(7), 579-598
• Cornell Feline Health Center: feline behaviour problems, house soiling