Cats scratch the litter box sides to mark territory and bury waste
When your cat scratches the walls or rim of the litter box instead of just digging in the litter, they are doing two things at once: marking the box as theirs and trying to cover their waste. Cats have scent glands in their paws, so every scratch deposits a chemical signal that says "this is mine." The scratching motion also helps them rake litter over their droppings, which is an instinct that goes back to their wild ancestors hiding from predators.
This behavior is normal and healthy. It means your cat is using the box for its intended purpose and feels find enough to perform their full bathroom routine. The scratching is not a sign of stress or a litter box problem — it is straightforward how cats finish the job.
Key Takeaways
- Scratching the litter box sides is how cats mark territory with scent glands in their paws and bury their waste.
- The behavior is instinctive and normal; cats inherited it from wild ancestors who needed to hide their scent from predators.
- Excessive scratching that scatters litter outside the box can be managed by using a box with higher sides or a litter mat underneath.
- If scratching is accompanied by avoiding the box or other changes in bathroom habits, the issue may be the litter type, box size, or cleanliness rather than the scratching itself.
How scent marking works in cats
Cats have scent glands located on the bottom of their paws, between the toe pads. When they scratch any surface — including the litter box — they leave behind pheromones that only other cats can detect. These chemical messages tell other cats that the space belongs to them. In a single-cat household, this is less about defending against rivals and more about claiming the litter box as a safe, personal space.
The scratching also serves a practical purpose. By raking their claws through the litter and against the box walls, cats loosen the litter and create a layer over their waste. This mimics what wild cats do to hide their scent from larger predators. Even though your indoor cat has no predators to hide from, the instinct remains strong.
Why cats scratch more on the sides than in the litter
Cats often scratch the vertical surfaces of the box — the walls and rim — because these areas are easier to mark with their paws than the loose litter below. The hard plastic or ceramic surface holds their scent longer and more visibly than litter does. Scratching the sides also allows them to reach higher, which makes the marking more noticeable to other cats if there are any in the household.
Some cats also scratch the sides because they are trying to dig deeper into the litter without actually moving much of it. If the litter is shallow or the box is too small, they may scratch the walls as a way of extending their digging space. This is especially common in cats that prefer to bury their waste deeply.
When side scratching becomes a litter box problem
Scratching the sides of the litter box is only a problem if it scatters litter across your floor. If your cat is flinging litter outside the box regularly, the issue is usually one of these: the box is too small, the litter is too light or fine, or the cat straightforward needs more digging room.
You can reduce scattered litter by switching to a box with higher sides — at least 12 inches tall — or by adding a litter mat underneath the box to catch stray pieces. Some owners use a storage container with an entrance hole cut into the side, which gives cats more vertical space and contains the mess. If your cat is scratching excessively and also avoiding the box or showing other signs of stress, the problem may not be the scratching itself but rather the litter type, box cleanliness, or box location.
Litter type and scratching behavior
The type of litter you use can affect how much your cat scratches. Lightweight litters like pine or paper move easily when scratched, so cats may scratch more to try to bury their waste properly. Heavier clay litters stay in place better and may reduce the amount of scratching needed. Some cats also prefer certain textures — fine-grain litter may feel better under their paws than larger pellets, which could change how vigorously they scratch.
If you recently switched litter brands or types and noticed an increase in side scratching, try going back to the previous litter for a week to see if the behavior changes. This can help you figure out whether the scratching is a response to the litter itself or a separate issue.
Box size and design affect scratching patterns
A litter box that is too small forces cats to scratch the walls because they cannot dig comfortably in the center. The general rule is that the box should be at least 1.5 times the length of your cat's body. If your cat is large or long, a standard box may feel cramped, and they may resort to scratching the sides as a way of creating more space.
Covered boxes can also increase side scratching because cats feel confined and may try to dig their way out or create more room. If your cat scratches the sides of a covered box constantly, try switching to an open box or a box with a removable top to see if the behavior decreases. Some cats straightforward prefer the freedom of an open design.
Frequently Asked Questions
Is it normal for cats to scratch the litter box sides every time they use it?
Yes, most cats scratch the sides or walls of the litter box as part of their normal bathroom routine. It is how they mark territory and bury their waste. If your cat is using the box regularly and not showing signs of stress or avoidance, the scratching is healthy behavior.
How can I stop my cat from scratching litter all over the floor?
Use a litter box with sides at least 12 inches tall, place a mat underneath to catch scattered litter, or try a storage container with a cut entrance hole. You can also experiment with heavier litter types that do not move as easily when scratched. If the box is too small for your cat, upgrading to a larger size may reduce the scratching.
Does excessive scratching mean my cat is unhappy with the litter box?
Not necessarily. Scratching is normal, but if it is paired with avoiding the box, going outside the box, or other changes in behavior, the issue may be the litter type, box cleanliness, location, or size. Check that you are scooping daily, the box is in a quiet location, and the litter depth is around 2 to 3 inches.
Can I train my cat to scratch less?
You cannot train a cat out of scratching the litter box because it is an instinctive behavior tied to marking territory and burying waste. Instead, focus on managing the mess by using a larger box, a litter mat, or heavier litter. If the scratching is extreme, it may signal that the box itself needs to change in size or design.
Why does my cat scratch the box more after I clean it?
After you clean the box, the scent glands from your cat's previous scratches are gone, so they re-mark the box to restore their territorial claim. This is normal and actually a sign that your cat feels the box is important to them. Cleaning the box regularly is still the right choice for hygiene.