I'm looking for a low-dust, lightweight cat litter that also helps me keep an eye on my cat's health.

If you want low dust + lightweight + health monitoring, I’d focus on color-changing silica/crystal litters. They can flag changes in urine pH and, with some products, possible blood—but they’re screening aids, not diagnostic tests.Purina+1

• Tidy Cats Tidy Care Alert - $27.98 (Chewy)
• PrettyLitter Health Monitoring - $27.49 (Chewy)
• Ultra by Cat’s Pride Health Monitor - $16.99 (Chewy)
• Michu Health Monitoring Tofu Litter - $22.99 (Chewy)

How I'd narrow it down

• Tidy Cats Tidy Care Alert — 8-lb silica crystals, explicitly low-dust and lightweight, with pH-detection color changes. Purina recommends establishing your cat's normal color over several days and contacting your vet if abnormal colors persist.Purina+1
• PrettyLitter Original Unscented — 6-lb silica crystals, low dust and very lightweight, with color changes associated with urine acidity/alkalinity and blood.PrettyLitter+1
• Cat's Pride/Ultra Health Monitor — particularly light: the manufacturer says it's 60% lighter than traditional litter and 99% dust-free, with pH color indicators.Cat's Pride
• Michu Health Monitoring Tofu — worth considering if you'd rather have a plant-based clumping litter than silica. It's only 5.5 lb and has a built-in pH indicator, though it has much less review history than the established crystal options.

One important caveat: color changes can have multiple explanations, so don't treat a color as proof that your cat has a UTI, kidney disease, stones, etc. Persistent or concerning changes warrant a veterinarian's evaluation.Vetstreet+1

If your priorities are specifically (1) least dust, (2) easiest to carry, (3) strongest health monitoring, and (4) good odor control, I can also .

If you want low dust + lightweight + health monitoring, color-changing crystal litter is the category I’d look at first. These use urine chemistry—primarily pH, and in some products blood indicators—to give you an early visual clue rather than simply being ordinary litter. They’re not diagnostic tests, so persistent or concerning changes should be discussed with a vet.Purina+1

Good options

• Tidy Cats Tidy Care Alert Health Monitoring - $27.98 (Chewy)

• PrettyLitter Health Monitoring Cat Litter - $27.49 (Chewy)

• Cat's Pride Ultra Health Monitor Micro Crystals - $39.99 (Chewy)

• Sustainably Yours Health Monitoring Formula - $28.99 (PETCO)

• Tidy Cats Tidy Care Alert — A particularly straightforward option: lightweight, low-dust silica crystals that change color based on urine pH. Purina recommends establishing your cat's normal color over several days and watching for persistent changes.Purina

• PrettyLitter Health Monitoring — Lightweight silica crystals with color changes for urine pH and blood-related indicators. The current original formula is 6 lb and unscented, and the manufacturer describes it as low-dust.PrettyLitter

• Cat's Pride Health Monitor — Another lightweight crystal option; the manufacturer says it's 60% lighter than traditional litter and 99.8% dust-free, with color changes indicating urine-pH changes.Cat's Pride

• Sustainably Yours Health Monitoring — Worth considering if you'd rather have a plant-based clumping litter instead of silica crystals; its health-monitoring technology uses plant-derived ingredients to react to urine pH.

One important distinction: if by "keep an eye on health" you mainly mean urinary health, these are useful for spotting changes in urine chemistry. They won't tell you that your cat definitely has a UTI, kidney disease, stones, etc. A persistent abnormal color, blood indication, straining, frequent trips to the box, or little/no urine warrants veterinary attention.

If you tell me how many cats you have, whether you prefer clumping or non-clumping, and your approximate budget per month, I can narrow these down to the most suitable 2–3 options.

If your priorities are low dust + lightweight + health monitoring, I’d start with PrettyLitter.

• PrettyLitter Health Monitoring Cat Litter, 8-lb bag - $27.49 (Chewy)

Why it fits

• Very lightweight: the silica crystals are substantially lighter than traditional clay; PrettyLitter says they can be up to 80% lighter.PrettyLitter
• Low dust: the company reports undetectable breathing-zone dust in lab testing.PrettyLitter
• Health monitoring: the crystals change color in response to urine pH and can indicate the presence of blood. Blue can indicate unusually alkaline urine, orange unusually acidic urine, and red blood.PrettyLitter Help
• Unscented option: I'd choose the original/unscented formula if monitoring your cat's urine is the priority.
• Less frequent replacement: the manufacturer says one 6-lb bag can last up to a month for one cat.PrettyLitter

Other good options

• Purina Tidy Cats Tidy Care Alert - $27.98 (Chewy)
• Cat's Pride Ultra Health Monitor - $16.99 (Chewy)
• Purrify Health Monitoring Cat Litter - $31.99 (Chewy)
• Sustainably Yours Health Monitoring Formula - $28.99 (PETCO)

My ranking:

1. PrettyLitter — best overall match for your three priorities.
2. Tidy Cats Tidy Care Alert — a good alternative if you prefer a major mainstream brand.
3. Cat's Pride Ultra Health Monitor — particularly interesting if you want a 5-lb lightweight crystal bag.
4. Sustainably Yours Health Monitoring — worth considering if you'd rather have a plant-based clumping litter.

One important caveat: color-changing litter is a screening/monitoring aid, not a diagnostic test. A persistent color change—or symptoms such as straining, frequent urination, crying in the box, or inability to urinate—warrants veterinary attention.Vetstreet+1

If you tell me your cat's age, whether you have one or multiple cats, and whether you prefer clumping or non-clumping, I can narrow this down to the best 2–3 choices for you.

If low dust + lightweight + health monitoring are your priorities, I’d focus on color-changing crystal or plant-based litters that react to urine chemistry.

My top picks

• Cat’s Pride Ultra Health Monitor Micro Crystals - $16.99 (Chewy)

• Tidy Cats Tidy Care Alert - $27.98 (Chewy)

• PrettyLitter Clumping Health Monitoring - $29.97 (Walmart)

• Purrify Health Monitoring Unscented - $31.99 (Chewy)

• Best for maximum lightness:

— 5-lb bag, advertised as 60% lighter and 99% dust-free, with color changes for urine-pH monitoring.Cat's Pride

• Best overall:

— lightweight, low-dust silica crystals with pH-detection color changes and strong odor control.Purina+1

• Best if you prefer clumping:

— lightweight silica crystals that clump while monitoring urinary pH. PrettyLitter also offers a non-clumping version.PrettyLitter

• Best plant-based option:

— tofu/pea/corn-based, clumping, color-changing, and advertised as 99.8% dust-free.purrifyhealth.com

One important caveat: these products are monitoring aids, not diagnostic tests. Persistent abnormal colors—especially indications of blood—should prompt a call to your veterinarian.Purina+1

If you tell me whether you prefer clumping vs. non-clumping and your budget, I can narrow these to the best 2–3 options.

If low dust + lightweight + health monitoring are your priorities, I’d focus on color-changing crystal litters. They can give you visual clues about urine pH and, in some formulas, blood.

My top picks

• PrettyLitter Health Monitoring Cat Litter - $24.73 (Walmart)

• Purina Tidy Cats Tidy Care Alert - $27.98 (Chewy)

• CheckUp Health Indicator Cat Litter - $23.95 (CheckUp)

• Sustainably Yours Health Monitoring Formula - $28.99 (PETCO)

— Best overall. Its unscented crystal formula is very lightweight, low-dust, and changes color in response to urine pH and visible blood. The standard bag is just 6 lb, and the manufacturer says it's up to 80% lighter than traditional clay.PrettyLitter+1

— Good alternative. An unscented silica-crystal litter that uses pH-sensitive color changes to flag potential urinary issues.Petco

— Worth considering if health monitoring is the priority. It's a 6-lb crystal litter specifically designed to signal blood or pH changes.

— Interesting plant-based option. It uses plant-based pH-monitoring technology rather than silica crystals, although it's heavier than the lightweight crystal options.

I'd pick PrettyLitter Original/Unscented for your criteria. It's currently marketed as 99% dust-free and lightweight, while its color-changing crystals monitor urinary pH and visible blood.PrettyLitter+1

One important caveat: health-monitoring litter is an early-warning aid, not a diagnostic test. A persistent color change—or symptoms such as straining, frequent urination, blood, or urinating outside the box—should prompt a veterinarian visit.PrettyLitter+1

If you'd like, I can also narrow this down to the best option under $25, best for a senior cat, or best clumping health-monitoring litter.