Is Walnut Shell Litter The Way to Go?

If you've never heard of it before, walnut shell cat litter comes from the absorbent inner fiber found inside natural walnut shells. And that's precisely what distinguishes it from clay.

You see, where clay works mainly by soaking up moisture and then relies on added fragrance or baking soda to cover odor, walnut shell litter actually neutralizes the ammonia odor directly rather than masking it. And, important to all cat owners, it's highly absorbent, which changes how the whole litter box behaves day to day.

Not convinced? This guide walks through what walnut shell litter is, how it stacks up against clay from an odor and dust standpoint, where it falls short, how to pick a formula for your household, and how to switch without upsetting a picky cat.

Let's start with this. Walnut cat litter is a natural litter that's made from crushed walnut shells. Unlike clay, which is mined from the earth, it comes from a renewable source. The shells are upcycled, meaning they are a byproduct of the food industry that gets repurposed instead of pulled from the ground. All important details for those who are serious about environmentally friendly alternatives when it comes to cat care.

The material comes in two general shapes. You will find fine granular textures that feel and scoop much like clay, and you will also find larger pellets. Granular formulas clump; most pellet versions, in contrast, do not. As a result, the familiar granular texture tends to win over cats and cat parents who are used to traditional clay, because nothing about the feel underfoot is strange.

Because it is plant-based, walnut litter is biodegradable, and many formulas are flushable and compostable. Note that flushing is not always permitted in certain living situations, so always check the rules first. Composting is fine too, but you'll want to keep it out of anything you use for vegetables or herbs.

Clumping clay litters bind moisture into a scoopable mass and handle smell after the fact. Walnut shell litter, by comparison, takes the absorbency further. Naturally Fresh reports that its walnut formula pulls in roughly three times the moisture that clay does, a claim the brand bases on its own product data. In practice, therefore, you get clumps that are drier and hold together more firmly, you replace the entire box less often, and the litter stays fresh for a longer stretch between scoopings.

It also produces far less dust. Clay litters often contain silica dust, the fine particles that raise respiratory concerns for cats and people alike. Walnut litter, on the other hand, produces much less of it, which makes the litter box area cleaner and easier on everyone's lungs. It is worth noting, however, that walnut is not the lowest-dust natural option; pellet litters or the "dust-free" corn cob litter from Nature's Miracle.

While it does deliver decent odor control, it may not match some of the clay or silica-based litters over time; as a result, you may need to scoop more often to keep smells down.

Tracking is the most common gripe. The dark brown color of walnut shells means the granules leave visible trails around your home, and granular formulas track more than pellets. That same dark color, furthermore, makes solid waste harder to spot and remove, which asks a little more diligence at scooping time.

Naturally Fresh is the leading name in the natural litter category, and the brand offers seven walnut-based formulas across several bag sizes. Six are clumping and one is a non-clumping pellet. Most are unscented, and every formula is biodegradable. Eco Shell, Inc., which developed the patented formula in 2010, now handles both the manufacturing and the marketing.

Now, cats notice changes, and a sudden swap can send a fussy one looking for other places to go. The safer path, instead, is a gradual transition. Rather than dumping out the old litter and filling the box with something unfamiliar, mix the new walnut litter into the existing litter and increase the walnut portion over several days until the box is fully converted.

The win-win-win is that it neutralizes ammonia rather than masking it, absorbs roughly three times better than clay, and produces far less dust than its counterparts.

Ready to change things up in the litter department? I'm thinking walnut shells might just be a good way to start.