How many litter boxes do you need for 2 cats, and what size should they be? These are the questions every multi-cat owner asks sooner or later. The answer is simpler than it seems.

How many litter boxes do you need for 2 cats?

In the cat world there's the N+1 rule: for N cats you need N+1 litter boxes. With 2 cats that's at least 3. In practice 2 boxes also works, but 3 is more comfortable for the cats and causes fewer odor problems.

The logic: cats are territorial animals. They don't always want to use the same box when another cat has just been. A second or third box gives them an alternative and reduces the chance of a cat going outside the box.

Can 2 cats share one automatic litter box?

Yes, they can. An automatic litter box cleans itself after every use, so the box is always clean for the next user. That makes a shared box much more workable than with a manual box.

But: even with an automatic box you need a second box as a back-up. When cleaning is in progress, or when a cat avoids the box because the other one was just in it, you want an alternative to be available.

Picture this: two cats, one large automatic box plus one regular box. That's the most practical and affordable combination for most people.

What size do you need?

With 2 cats, the size of the litter box is extra important. A small box fills up faster and is less comfortable for two cats to share.

How do you place litter boxes with 2 cats?

In separate rooms

Don't put the two boxes next to each other. Cats see two boxes side by side as one toilet. Put them in separate rooms or at least on different sides of a room.

Not next to food or water

Cats don't like to eat near their toilet. Always keep the litter box away from the food and water bowls. That's just as true for cats as it is for people.

Not in busy spots

A litter box next to the washing machine or in a busy hallway gets avoided. Cats want peace and privacy when they do their business. Choose quiet spots, even if they're less convenient for you.

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Frequently asked questions

Can 2 cats really share one automatic litter box? +

Yes, as long as the box is big enough and you have a second box as a back-up. The automatic cleaning makes sure the box is clean after every use, which makes sharing more workable than with a manual box. The N+1 rule does remain the ideal starting point, though.

How often do I need to empty the waste drawer with 2 cats? +

With 2 cats sharing the same box, expect to empty the waste drawer once a week. That's still a lot less than scooping daily with a manual box. Use clumping litter for more compact clumps and lower litter consumption.

My cat doesn't want to use the other cat's litter box either. What now? +

That points to territorial behavior. Put a third box in a spot where the dominant cat is less likely to go. Avoid placing boxes side by side, because cats see two boxes next to each other as one toilet. More spread, more privacy.

Which cat litter works best? +

Clumping litter is required for automatic litter boxes. Bentonite and tofu litter clump well and are compatible with most self-cleaning models. Non-clumping litter doesn't work and damages the cleaning mechanism.

Is an automatic litter box safe for multiple cats? +

Yes, as long as the model has a safety sensor. The sensor detects presence in the box and stops the cleaning process if a cat is still inside. This also applies if a second cat enters the box while cleaning has already started for the first cat.

Does a bigger box also need more litter? +

Yes, the first fill takes more litter. After the first fill, an automatic box uses less litter than a manual one, because only the clumps are removed and the rest stays intact. In the long run you save on litter.

Conclusion

With 2 cats you need at least 2 litter boxes. A large automatic litter box as the main box, supplemented by a second box in another spot in your home, is the most practical setup.

Check out the litter boxes collection or read the complete guide to self-cleaning litter boxes for more information.