Vet-recommended clumping litter for urine monitoring

Your vet has asked you to monitor urine clump size daily — that's a serious but very manageable task, and getting the right litter makes it genuinely useful rather than guesswork. Most cats prefer unscented, fine-grained clumping litter anyway, and the good news is that preference lines up exactly with what works best for tracking clumps: you need something that forms tight, dense, consistent clumps so you can actually compare size day to day. Can I ask — is this for a single cat, and are you currently using any litter that's been causing issues? Also, any requirements like dust-free or low-tracking?

That context really helps. With kidney monitoring, you need a litter that clumps hard and fast — loose or crumbly clumps make it impossible to judge volume accurately. Dust-free is also important in a bedroom. Can I ask what litter you're using at the moment, and roughly what size litter box she uses?

That's the problem right there — soft, crumbly clumps are useless for monitoring. You need something that sets firm enough to lift out in one piece and measure or compare visually. My recommendation is Catsan Ultra Clumping Cat Litter. It's made from natural mineral granules, forms very dense, solid clumps that hold their shape when you scoop, and it's consistently one of the lower-dust options available. It's unscented, which your cat will thank you for, and it's widely available on Amazon UK. The clumps come out compact and consistent, so you'll quickly get a baseline and notice any real changes in size. I'd suggest scooping at the same time each day and photographing the clumps next to a ruler for the first two weeks — that gives you and your vet something concrete.

Good instinct to think about that. Since she's box-reliable, a gradual switch is low-risk but still the right approach. Mix about 25% Catsan Ultra into her current litter for three or four days, then go 50/50, then full switch over about ten days total. Because you're monitoring clumps, keep the transition period in mind — the clumps won't be fully comparable until she's been on the new litter alone for at least a week, so I'd tell your vet the monitoring baseline starts once the switch is complete. One more thing: fill the tray a bit deeper than you might normally, around 8–10cm — Catsan Ultra clumps best with decent depth and it stops clumps sticking to the bottom of the tray.

You're all set. The fact that you're on top of this early is genuinely the best thing for her — kidney issues caught at this stage are very manageable. Catsan Ultra should give you reliable, consistent clumps to work from. Hope the next vet check brings good news.