TLDR Review: ARM & HAMMER Ultra Last Cat Litter
Pros
- •Excellent odor control that locks in smells for days, even with multiple cats—dramatically superior to competing alternatives
- •Creates strong, dry clumps that make scooping quick and easy
- •Completely dusree or low-dust formula, which is better for respiratory health and works well with automatic litter robots
- •Unscented formula appeals to cats and avoids overwhelming perfume scents that can trigger sensitivities
- •Minimal tracking—keeps litter mostly contained to the box area instead of spreading throughout your home
- •Safe for cats with no adverse reactions or sneezing observed
- •Generally welccepted by cats, even when switching from other brands
Cons
- •The 1b bag is notably heavy, making it genuinely challenging to carry, transport, and store
- •Inconsistent fragrance quality—despite being labeled unscented, some bags emit a perfume or floral scent that can trigger allergies and breathing issues in sensitive cats
- •Clumping can be slow, requiring at least 15 minutes to fully set, and sometimes breaks apart into smaller pieces
- •Tracking is inconsistent across user experiences—some report minimal tracking while others note it spreads around the litter box area
Bottom Line
ARM & HAMMER Ultra Last delivers exceptional odor control and creates clumps that make maintenance genuinely easy, making it a solid choice if you have multiple cats and prioritize performance over convenience. The dust-free formula is a real win for respiratory health. However, the hefty 18-lb bags are a legitimate pain point if you have mobility concerns, and the inconsistent fragrance despite the "unscented" label is worth noting if your cat has sensitivities. If the weight and potential fragrance inconsistency don't bother you, this litter punches well above its price point—just be prepared to commit to a brand once you find a batch that works for your feline friend.
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