While walnut shell litter is a great option for many cats, there is a risk of allergic reactions in humans or cats with nut allergies. If you’re not sure if your cat has a nut allergy, try testing a small amount of litter and monitoring your cat for irritation.
You might also notice more tracking with walnut shell litter. While you can keep this to a minimum with a litter-trapping mat, you might need to sweep up a little more frequently around your cat’s litter box.
Walnut shell litter can also be more difficult to find in some pet stores, though availability is rising with its popularity. Fortunately, you can conveniently order walnut-shell cat litter online.