Cat Litter Types Compared: Clay, Silica, Pine, Tofu and Paper

Walk down the litter aisle and you will find clay, crystals, pine pellets, tofu, corn, wheat, walnut shell and recycled paper. They all do the same basic job, but they behave very differently in the box and in your home. There is no single best litter, only the best one for your cat and your household, and the cat's opinion counts first. This guide compares the main types and explains how to change without causing accidents.

What Cats Tend to Prefer

Cats are fussy about what they dig in. Many seem to favour fine-grained, unscented litter that feels like sand, which may reflect their desert-dwelling ancestry. Strong perfumes that appeal to people can put a cat off, because a cat's sense of smell is far sharper than ours. If your cat is happy with the litter it has, that is a good reason to stay with it.

The Main Types

Clumping clay

Made from bentonite clay, this forms firm balls around urine that you scoop out. It is widely available, relatively cheap and good at controlling odour, and many cats like the texture. The downsides are that it is heavy, can be dusty, is not biodegradable and is mined. Dust matters most if your cat or anyone at home has airway problems such as asthma.

Non-clumping clay

This absorbs moisture but does not form balls, so you need to replace the whole box more often. It is cheap, but the tray must be emptied and washed regularly to stay fresh.

Silica gel crystals

Crystals absorb a lot of urine and tend to produce less dust than clay. They are light to carry and last a good while, but cost more, can be sharp or noisy underfoot, and some cats dislike the feel. Stir them regularly and follow the pack instructions.

Pine, wood and sawdust pellets

Pellets are low in dust and smell naturally of wood. They do not clump: when wet they break down into sawdust that falls to the bottom of the tray, so they often work with a sifting tray system. Some cats dislike the hard pellets on their paws.

Tofu, corn and wheat

These plant-based litters usually clump, are lightweight and are often marketed as flushable or biodegradable. Check the manufacturer's disposal advice rather than assuming, because flushing cat litter can damage plumbing in many places. Grain-based litters can attract insects or grow mould if they stay damp, so keep them dry and replace them if you notice a musty smell.

Recycled paper

Paper pellets or granules are soft, very low in dust and a sensible choice after surgery, when your vet may recommend avoiding litter that can stick to a wound. They are less effective at odour control and may need more frequent changing.

Quick Comparison

• Dust: usually lowest in paper, pine pellets and tofu; usually highest in some clays
• Odour control: generally good in clumping clay and silica; weaker in paper
• Tracking: fine-grained litters stick to paws and fur more than pellets
• Environmental impact: plant-based and paper litters are biodegradable; clay and silica are not
• Cost: clay is usually cheapest; tofu and some plant-based litters cost more

Individual products within each type vary widely, so treat this as a rule of thumb rather than a guarantee.

A veterinary hospital walks through the common litter types and their pros and cons.

Scented, Deodorised and "Low-Tracking" Claims

Added fragrance is mostly for the buyer's benefit. A cat that finds the smell unpleasant may start going elsewhere in the house. Unscented litter combined with frequent scooping controls odour better than perfume does.

How to Switch Litter Safely

Cats are creatures of habit, and an abrupt change is a common cause of litter box avoidance. A gradual switch takes the pressure off:

• Start by mixing about a quarter of the new litter into the old.
• Over one to two weeks, increase the proportion of new litter step by step.
• Watch for signs of refusal: perching on the edge, digging excessively, or going outside the box.
• If your cat objects, go back to the previous mix and slow down.
• To test a new type, put a second box beside the original with the new litter and let your cat choose.

A step-by-step approach to transitioning a cat onto a new litter.

Depth, Scooping and Changing

• Depth: around 5 cm (2 inches) of clumping litter is a common starting point. Too shallow and cats cannot dig; too deep can encourage tracking.
• Scoop at least once a day, and more often with several cats.
• Empty and wash the box with mild unscented soap and warm water regularly, since urine odour builds up in plastic. Avoid strong-smelling cleaners.
• Number of boxes: a common guideline is one box per cat plus one extra.

Health Clues in the Litter

The box is a daily health check. Bigger or more frequent urine clumps, blood in the urine, straining, very hard stools or persistent diarrhoea are all reasons to call your vet. A male cat straining to pass urine with little or nothing coming out is an emergency, so seek help immediately. If a cat that has always used the box suddenly stops, a medical cause such as a urinary problem is worth ruling out before assuming it is a behaviour issue.

Another overview of how different litter types compare.

Special Cases

• Kittens: very young kittens may eat litter. Many vets advise a non-clumping or plant-based type for the youngest ones, so ask yours.
• Cats with asthma or respiratory disease: choose a low-dust litter and avoid scents.
• Senior or arthritic cats: use a box with a low entry and soft litter that is comfortable to stand in.
• After surgery: follow your vet's advice, which often means shredded paper for a short time.

The Bottom Line

Pick a litter your cat accepts, your household can tolerate and you can keep buying. Unscented, low-dust and clumping suits many homes, but a different type can work better for you. Change gradually, scoop daily and pay attention to what the box tells you about your cat's health.

This article is general information, not veterinary advice. If your cat's toileting habits change, speak to your vet.