Arm & Hammer Litter Ultra Last Unscented Clumping Clay Cat Litter, 18-lb box

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At a Glance

  • Unscented
  • Clumping
  • Made in USA
  • All Lifestages

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($0.89 /lb)
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About This Item

Details

  • Feel confident using a litter that battles waste with furbaby-friendly baking soda.
  • Each granule is coated with Arm & Hammer Baking Soda odor neutralizers for long-lasting results.
  • Avoid messy dust clouds and tracking, thanks to this litter’s 99.9% dust-free formulation.
  • This cat litter forms rock-solid clumps that let you remove the source of odors easily to help you maintain litter box freshness.
  • This clumping cat litter is formulated for long-lasting freshness, with unscented power for a more natural-smelling home.

Instructions

Learn More About Arm & Hammer Litter From Our Team of Experts

About Arm & Hammer Ultra Last Unscented Cat Litter

Take Your Pick of the Litter

Easy-scooping Arm & Hammer clumping cat litter has powerful odor eliminators and Arm & Hammer Baking Soda in every scoop to neutralize litter box odors. Whether you have a one-cat or multi-cat home, Arm & Hammer has the kitty litter to give your cats the freshness they deserve. Choose from unscented litters like Ultra Last or pet-friendly scented litters like Forever Fresh Lavender or Cedarwood.

Pet-Friendly With Baking Soda

Long-lasting odor control plus baking soda freshness is the secret behind Arm & Hammer Ultra Last Unscented Clumping Cat Litter.

Long-Lasting Odor Control

This special formula of Arm & Hammer cat litter provides long-lasting odor control, even when you can’t scoop!

Baking Soda Freshness

Arm & Hammer Baking Soda helps make Ultra Last the freshest litter on the block.

Unscented for a Refreshing Experience

This clumping litter combines long-lasting freshness and odor control with a clean and refreshing unscented experience.

Unscented

Give your litter box—and your cat!—a fresh and pet-friendly take on unscented cat litter.

With Baking Soda

Baking soda-coated granules plus special odor eliminators provide serious odor control, even when you can’t scoop.

Long-Lasting Odor Control

The high-performing Ultra Last Unscented formula provides long-lasting odor control.

Instant Odor Destroyers

Formulated for lasting freshness and a clean, unscented litter box experience your cat will love.

About Arm & Hammer

For over 165 years, people have trusted the Arm & Hammer brand for a range of versatile, effective and safe household products. In 1992, they introduced their signature cat litter, made with odor-absorbing baking soda, to give pet parents a powerful solution for litter box odor. Their line for pets includes a range of innovative cat litter and dental care products designed to make the lives of people and pets better every day.

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Questions & Answers

3 Customer Questions

Is this suitable for a multicat household?

Answer by Chewy • Dec 27, 2021
This litter is suitable for use in multi-cat homes.

Does it slide out of litter box easily

Answer by Chewy • Dec 30, 2021
This litter is not part of the Arm & Hammer Litter Slide line.

What are the ingredients in this litter? Is it 100% sodium bentonite clay?

Answer by Chewy • Mar 21, 2025
The ingredients include: Dolomitic limestone, Bentonite, Water, Guar gum, Sodium bicarbonate, Fragrance and Sodium hypochlorite.
Reviews
Write a Review
4.2
Rated 4.2 out of 5 stars
708 Ratings
Terms & Conditions

Customers Mention

Chewy identifies key considerations with the help of artificial intelligence and our veterinarians.

Clumping Ability

68% Positive

Dust Control

66% Positive

Longevity

69% Positive

Odor Control

64% Positive

260 Customer Reviews

Rated 2 out of 5 stars
By Joy on Oct 22, 2025
Top 250 Contributor

We're Unimpressed/$$$

I like usually Arm and Hammer cat litter but this one is just okay yet expensive. At the price per pound I really expected to love it! I disagree with the term "Ultra

I like usually Arm and Hammer cat litter but this one is just okay yet expensive. At the price per pound I really expected to love it! I disagree with the term "Ultra Last", it's just a nothing special pricey unscented litter. Unfortunately, I'm at the stage in my life (73) when trying to carry a 40 lb container of anything up my porch stairs isn't a smart idea... Otherwise, I would buy the larger A&H boxes that Chewy carries. The value is so much better! But I have found a different brand that packages 42 lbs of litter devided into four 10.5 lb bags. How considerate! I can carry the little bags one at a time. And it's good litter as well, so now I don't have to order from elsewhere and Logan has plenty of nice fresh litter. Thanks Chewy!

Rated 5 out of 5 stars
By CatLibrarian on Jan 9, 2026

It Actually Clumps

Most of the kitty litter I have bought recently just balls up into a semi-clumping mess, so I was pleasantly surprised to find that this version of Arm & Hammer's

Most of the kitty litter I have bought recently just balls up into a semi-clumping mess, so I was pleasantly surprised to find that this version of Arm & Hammer's litter clumps like most litter used to.

Rated 1 out of 5 stars
By Tami on Jan 2, 2026

Shouldn’t have shipped

Item arrived in huge plastic bag. As I opened the bag I noticed a hole in the litter box with litter pouring out. This item shouldn’t have been shipped in this

Item arrived in huge plastic bag. As I opened the bag I noticed a hole in the litter box with litter pouring out. This item shouldn’t have been shipped in this condition.

Rated 2 out of 5 stars
By T on Nov 6, 2025

It works, in that it's litter

I purchased this because there was a special, and I usually have good luck with Arm&Hammer products. I trust the band. Unfortunately, my cats HATE this litter. They

I purchased this because there was a special, and I usually have good luck with Arm&Hammer products. I trust the band. Unfortunately, my cats HATE this litter. They are used to the finer textured A&H Clump and Seal litter. They throw this one out of their boxes, and Mayhem is having issues with getting the larger textured litter from under his claws and between his pads.

Rated 2 out of 5 stars
By Yunus on Sep 8, 2025

Not unscented

Careful with this one. It looks like the perfect litter, but it's far from it. At first it seems looks like it's not dusty and has no smell (yay). But after your

Careful with this one. It looks like the perfect litter, but it's far from it. At first it seems looks like it's not dusty and has no smell (yay). But after your cats are done using it, it will trigger your air purifiers, and the light fragrance will appear too. Switched from Boxiecat, while it's not the best in the world, it didn't trigger my asthma. Can't imagine what it's like for the cats. I guess it's better than those obnoxiously scented ones with dust clouds. So it gets two stars.

Rated 5 out of 5 stars
By Patrice on Jan 1, 2026

Excellent product

No scent, minimal amount of dust , almost no tracking, and firm clumps. I have found my new litter!

No scent, minimal amount of dust , almost no tracking, and firm clumps. I have found my new litter!

Rated 4 out of 5 stars
By Rachel on Nov 11, 2025

Packing/Shipping issue with litter

Product does its job. Packing/shipping seem to be an issue-as sometimes the boxes of litter get broken open in shipping.

Product does its job. Packing/shipping seem to be an issue-as sometimes the boxes of litter get broken open in shipping.

Rated 1 out of 5 stars
By Abby on Aug 20, 2025

Product is great, shipping not so much

I’ve ordered this several times and up until now have been pleased with the product and purchase & delivery process. However, the most recent shipment was packaged

I’ve ordered this several times and up until now have been pleased with the product and purchase & delivery process. However, the most recent shipment was packaged horribly and resulted in litter everywhere and a busted up pkg of another item I order that luckily didn’t break. I hope this is a one time event.

Rated 4 out of 5 stars
By Joanne on Oct 26, 2025

leaking box

the box leaks, so that there is litter all over the shipping box and when poured into the basin it goes all over the floor

the box leaks, so that there is litter all over the shipping box and when poured into the basin it goes all over the floor

Rated 3 out of 5 stars
By Maureen on Sep 23, 2025

Too sandy.

I always buy Ultra Last because the grains are bigger and it clumps so well, but this box was like beach sand. I’ll probably just buy it at the store from now o

I always buy Ultra Last because the grains are bigger and it clumps so well, but this box was like beach sand. I’ll probably just buy it at the store from now on.