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What to Do if Your Cat's Not Using the Litter Box

Name: Door Buddy® Cat Door Prop
Brand: Door Buddy
SKU: DB-DOG-PROPW
Price: 20.99 USD
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By: Door Buddy Editors | Published: April 9, 2025

Fluffy cream cat sitting beside its litter box filled with clumping pellet litter and a scoop

The dog's been sniffing around the litter box again, and now there's a mess somewhere it shouldn't be. If your cat's not using the litter box, there's almost always a reason — and most of the time, it's fixable.

This guide covers the medical causes worth ruling out first, the setup mistakes that push cats away, and the one cause most litter box articles skip: another pet in the house.

Check for a Medical Cause First

Before anything else, rule out a health problem. Cats don't avoid the litter box for attention. They avoid it because something hurts, and the box has become the place where it hurts most.

Conditions linked to litter box avoidance include:

Feline lower urinary tract disease (FLUTD)
Bacterial cystitis
Kidney disease
Diabetes
Arthritis or other mobility issues that make climbing into the box painful

Call your vet right away if you notice any of these:

Frequent trips to the box with little or no output
Straining
Crying while urinating
Blood in the urine

These are signs your cat might be sick, not signs of a behavior problem. Treat them as urgent, not wait-and-see. For a broader look at cat behavior issues and when they need treatment, the ASPCA's guide to common cat behavior issues is a solid starting point.

Litter Box Setup Mistakes That Push Cats Away

Once a vet visit rules out a medical cause, the setup itself is the next place to look. Cats are specific about this, and small mistakes add up.

White and blue crystal cat litter spilled beside a litter box and scoop

Litter Type and Texture

Cats can reject a litter over scent, texture, or dust — even one they used to like. If you've switched brands recently, reverse that before troubleshooting anything else. Glo Litter is a low-dust, low-scent option worth trying if a cat seems picky about texture.

Box Size, Cleanliness, and Placement

Get these right, and most litter box problems disappear on their own:

Do scoop daily. A dirty box is the single most common reason cats look elsewhere.
Do provide 1 litter box per cat, plus 1 extra.
Do keep boxes in different areas of the house in a multi-cat home.
Do pick a box big enough for your cat to turn around in comfortably.
Don't place boxes near food or water — cats won't use a bathroom next to their kitchen.
Don't tuck the box somewhere loud, high-traffic, or hard to reach.

Why Is My Cat Not Using the Litter Box Suddenly?

A cat who used the box fine last month and won't touch it now is usually reacting to a change, not developing a new personality. Common triggers include moving to a new home, a new pet or houseguest, rearranged furniture, or a new baby in the household. Cats read routine as safety. Anything that disrupts it can show up as a litter box problem within days.

The fix is patience plus consistency:

Keep the box in the same spot.
Keep the rest of the routine as normal as possible.
Give your cat a few weeks to settle before assuming something's wrong with the box itself.

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How to Keep the Dog Out of the Litter Box

Here's the cause most litter box articles skip: the box is working fine, but the dog won't leave it alone. If your cat's avoiding it — or you're just tired of finding the box raided — a new dog or puppy in the house is usually why.

This is one of the most common reasons cats stop using the litter box. It's not a training problem you can solve by asking nicely. Dogs are drawn to the litter box. Most cats won't use a box a dog has just been in. One Door Buddy customer put it simply after their dog kept getting into the closet where the box lived: "This thing seriously changed our lives! Our dog would constantly be getting into the litter box in the closet and we could NOT think of a way to solve the problem." Another called it "one of those 'why didn't I think of this!?' inventions."

Door Buddy is the original no-cut cat door alternative, assembled in the USA. It holds any interior door open just enough for your cat to get through. Not enough for your dog.

No holes. No permanent modifications. Installs in minutes.
The Door Strap is tool-free and adhesive — the right choice for an average-sized dog.
For a large or persistent dog, the Cat Door Prop is the stronger option. It reuses your door frame's existing strike-plate holes with a screwdriver and the included Torx wrench. No new marks, no drilling.

Over 1 million Door Buddy products have been sold, backed by 50,000+ positive reviews and a 90-Day Money-Back Guarantee. Shop the Door Buddy and give your cat its litter box back.

Dog peeking through a door held open by a Door Buddy Door Strap.

Litter Box Solutions by Life Stage

Kittens Not Using the Litter Box

A new kitten not using the litter box is usually about the setup, not the age. Kittens do best with unscented, non-clumping litter and a box low enough to climb into easily. Litter training is instinctive. Most kittens figure it out on their own once the box is accessible and clean.

Senior Cats

A senior cat not using the litter box is often dealing with arthritis, not defiance. Switch to a low-sided box so climbing in doesn't hurt, and keep it on the same floor your cat spends the most time on.

Multi-Cat Homes

Cats can be territorial about litter boxes the same way they are about food. Multiple boxes in separate locations reduce the tension that causes one cat to guard — or avoid — a shared box.

Reading Your Cat's Stress Signals

Litter box avoidance is often the first visible sign of stress, not the only one. Watch for hiding more than usual, sudden aggression, over-grooming, or a drop in appetite alongside the litter box issue. Together, these point to stress rather than a dirty box or a medical problem. A vet visit is still worth ruling that out first.

Does Diet Affect Litter Box Habits?

Diet shapes stool consistency and hydration. Both affect how comfortable — and how often — litter box trips are for your cat. A sudden food change can cause loose stool or straining that makes a cat associate the box with discomfort. If you're switching foods, do it gradually over 1 to 2 weeks.

Frequently Asked Questions

Q: How often should I scoop the litter box?
Q: How many litter boxes do I need?
Q: Can stress really cause litter box avoidance?
Q: How often should a healthy cat use the litter box?
Q: When should I take my cat to the vet?
Q: Do cats need to be litter trained?

The Bottom Line

Most litter box problems come down to 4 things: a health issue, the setup, stress, or another pet getting in the way. Rule out the vet visit first. Fix what you can in the box. And if the real problem has 4 legs and a wagging tail, Door Buddy handles the rest.

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