ARM & HAMMER LITTER Ultra Last Unscented Clumping Clay Cat Litter, 18-lb box -

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

By Arm & Hammer Litter
Rated 3.7176 out of 5 stars
Scent: Unscented
Scent: Unscented
Size: 18-lb box
Size: 18-lb box

$15.99Chewy Price

In Stock
FREE 1-3 day shipping over $49

About This Item


  • Made of highly absorbent, unscented microgranules.
  • Features baking soda crystals for rapid urine and fecal odor reduction.
  • Forms solid clumps for convenient cleaning.
  • Features a lightweight, low-dust formula.
  • Minimal tracking for easy maintenance.

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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.


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.

Shop Arm & Hammer

Questions & Answers

2 Customer Questions

Is this suitable for a multicat household?
Answer by ChewyDec 27, 2021
This litter is suitable for use in multi-cat homes.

Does it slide out of litter box easily
Answer by ChewyDec 30, 2021
This litter is not part of the Arm & Hammer Litter Slide line.

ReviewsWrite a Review

Rated 3.7176 out of 5 stars
85 Ratings
Would recommend to a friend

85 Customer Reviews

Rated 5 out of 5 stars
By Pinto on May 12, 2023

Great Brand That’s Easy To Find

I mix this with Dr. Elsey’s because the Dr. E’s seems to clump really hard making scooping a bit challenging. But, this cuts it down perfectly, which I appreciate. Arm & Hammer is a great product that can be found just about anywhere and has been my go-to for over a decade. I now prefer unscented litter but either way, it’s a great product. This “Ultra Last” does seem to be a little longer lasting than other A&H litter, but I haven’t done any hard research so take that with a grain of salt.

Rated 3 out of 5 stars
By Percysmom on May 20, 2023

Kind of stinks

It clumped well enough but I could not take the smell. It stayed with me every time I cleaned the box. Going back to my Fresh Step unscented!

Rated 1 out of 5 stars
By Peachy1 on Apr 20, 2023

Did Not Favor This Product

Recently ordered and used this litter product. The litter does not completely cover the odor of the cat waste. The clumping is so-so. However it seems to be a low dust litter.

Rated 5 out of 5 stars
By RAE on Apr 9, 2023

holds odor in

First time that I have bought Ultra Last and I am sold on it! It really holds odor down between cleanings . My cats adapted to it immediately.

Rated 2 out of 5 stars
By Susan on Jan 19, 2023

Miss Cats Pride

Ever since Chewy discontinued Cats Pride litter, I have tried several alternative unscented litters. None of them are up to snuff and ALL of them end up on my bed. Never had this problem with the Cats Pride and unfortunately will have to go back to lugging home from the grocery store (readily available).

Rated 4 out of 5 stars
By Unhappymom on Mar 28, 2023

Cats avoiding litter box at night

My female cat has been leaving her clumps on the carpet outside the litter box. My male cat has had discharges on the carpet also.

Rated 5 out of 5 stars
By pawpurri on Dec 14, 2022

Best on the market.

I have tried many cat litters , for up to 4 cats at a time, and 2 or 3 of the Arm & Hammer. None come anywhere near Ultra Last's ability to keep odor at bay - even Multi Cat. Being a bit facetious, I don't get why we need to have 20 different varieties. Really, "slip and slide", clump and slide, slip and clump, spit and shine - Make ONE BEST like "Ultra Last" and go on to make other items best also. And Chewy, please don't quit carrying it - it's the only Arm & Hammer I'll use !

Rated 2 out of 5 stars
By Ellen on Jan 23, 2023

Works fine, but dusty!

I chose this because I like Arm & Hammer brand, and really wanted "UNSCENTED," but was dismayed by the clouds of dust that arose every time I added litter. Will not buy again

Rated 5 out of 5 stars
By Booweiss on Feb 3, 2023

Best litter for our household

Our cats like this litter, it has no odor at all, and clumps tightly. Just wish it were also available in stores for a quick replacement as needed.

Rated 1 out of 5 stars
By Debwiz on Nov 12, 2022

Disgusting scent

I unpack my Chewy deliveries outside then bring in contents. This stuff went straight into the garage to use for spills. Horrible synthetic-type citrus aroma. My bad: "unscented" does NOT mean the same as "fragrance free"