Her kidneys can’t hold on to what she needs anymore. So each time she pees, she loses a little more of her life.

Renal diet, fluids under the skin, a water fountain in every room — and she still feels lighter every time you pick her up. After twelve years in feline consults, here's what I watched leave these cats every single day, and almost nobody put back.

Updated 12 Oct 2026

Read time: 5 mins

Written by Kayla Brooks

RVN Registered Veterinary Nurse, feline medicine

If she's drinking a lot more than she used to.

 

If you can feel her spine now when you stroke her, and you couldn't six months ago.

 

If she's stopped jumping onto the bed and waits on the floor to be lifted.

 

If you've told yourself "at least she's drinking", and you think this is good because kidney cats need more water.

 

Then this is for you. Because that last sentence is the one I most want to talk you out of.

The Sentence I Heard in Almost Every Kidney Consult

I spent twelve years nursing in a clinic with a heavy feline caseload. CKD cats were our regulars, and I heard one sentence more than any other:

 

"Well, at least she's drinking."

 

Owners said it with relief. A cat who still walks to the water bowl feels like a cat who's still fighting.

 

The protocol was almost always the same: a renal diet, more water, and subcutaneous fluids once she started to dry out.

 

The pattern was too. She'd hold steady, then at the next weigh-in she'd be a little lighter, a little stiffer in the back legs, her coat a little duller. Drinking just as much — and quietly fading.

 

Nobody was doing anything wrong. But "at least she's drinking" is the most misunderstood sentence in this disease.

Why She Drinks So Much in the First Place

Cats descend from desert hunters, and healthy feline kidneys are superb water-savers. They filter her blood, pull back everything worth keeping — water, potassium, B vitamins — and let out only a little concentrated urine.

 

Think of them as a fine filter. CKD turns that filter into a sieve.

 

As kidney tissue is lost, she can't concentrate her urine, so water pours straight through. She pees more — those bigger litter clumps — and drinks more to keep up. The empty water bowl isn't a sign she's fighting. It's a sign she's leaking.

 

And water isn't the only thing going down the sieve.

 

Potassium. CKD cats commonly lose too much potassium in their urine. Low potassium shows up as muscle weakness, stiffness and a poor coat — and may push the kidney disease further.

 

B vitamins. They're water-soluble, so they wash out with the urine. They run her appetite, her energy, her nerves.

 

Every extra lap at the bowl means extra urine — and a little more of what keeps her strong, gone.

She's drinking more. And she's losing more because of it.

What "Getting Weaker" Actually Means

The weakness you're seeing isn't just "old age." The changes are slow, so ageing is the story everyone reaches for. But line them up against what's going down the sieve:

 

The wobbly back legs and the skipped jump — muscle short of potassium.

 

The dull, thin coat — a classic sign vets look for when potassium runs low.

 

The sleepiness and fading appetite — a body short on B vitamins.

 

Then it spirals. A weak cat eats less, so she takes in even less potassium and fewer B vitamins. Low potassium may push the kidneys further downhill. Weaker kidneys leak more.

 

The goal isn't just more water going in. It's less of her going out.

Why More Water Alone Can't Fix It

The fountain and wet food put more water in. But plain water carries no potassium and no B vitamins — and in a cat who can't concentrate urine, more water can mean more flushing.

 

Subcutaneous fluids rehydrate her fast. But they mean a needle and a second pair of hands, and do nothing about what she loses between sessions.

 

The renal diet has added potassium and B vitamins — but only if she eats all of it, every day.

 

None of them puts back water, potassium and B vitamins together, every day, in a form she takes willingly.

The Three Things the Renal Literature Keeps Coming Back To

1. Water she takes in beyond the bowl.

In one study, adding water to dry food didn't raise total intake — the cats just drank less from the bowl. But when researchers offered a flavoured, nutrient-enriched water as a separate "third bowl," cats drank it on top of their usual water. Total daily liquid intake rose by an average of 28%, and their urine became more dilute.

 

Cats who won't drink more water will lap up more liquid when it tastes like food.

 

2. Potassium, replaced daily.

Potassium supplementation is standard in CKD management to offset what's lost in urine. The key word is daily — the sieve doesn't take days off.

 

3. B vitamins, replaced daily.

They don't store well, and CKD cats lose more while eating less. That's why kidney diets add extra.

 

Can I put back the water, the potassium and the B vitamins she's losing — every day — without a needle and three more products?

Why This Was Nearly Impossible in Practice

I tried. I recommended it. And it failed for reasons that had nothing to do with the science.

 

She wouldn't touch the powder. Potassium supplements are often bitter. Sprinkle it on the one food she'll eat, and she walks away from that too.

 

"Just add water" didn't work. Fountains, wet food, bowls in every room — she drank about the same.

It was three products and a needle. Three costs, three schedules, three chances to fail.

 

Nobody could tell owners how much. "Add some potassium." Not a number in sight.

 

Then I found the one product that fixed all four.

What Fureeze Built — and Why It's Different

Fureeze is an Australian company (shipping to the US and UK) whose founder hit the same four walls.

 

Their kidney-cat customers kept asking: "She's drinking all day — why is she still getting weaker?" So they treated it as a replacement problem, not a water problem. The result is the Daily Kidney Hydration Supplement.

 

It's a drink, not a powder. Each sachet mixes with water into a rich, savoury, meat-flavoured drink cats lap up like gravy. It goes in a separate "third bowl" — the same approach that raised liquid intake in the studies — so nothing touches the one meal she'll eat.

 

All three things, in one sachet:

Water she'll actually take in

  • A flavoured, food-like drink, on top of her normal water bowl

Potassium, replaced daily

  • 39mg potassium per sachet

B vitamins, replaced daily

  • 4.5mg B-complex vitamins per sachet

Water. Potassium. B vitamins. One sachet. One bowl.

But She's Already on a Kidney Diet

That's exactly the point. Keep it — and the fluids — if they're part of her vet's plan.

 

The renal diet adds potassium and B vitamins, but only if she eats the whole bowl. Most kidney cats don't. In a addition, renal diet always loses the nutrients during production.

 

The fountain adds water, but none of what she's losing.

 

Subcutaneous fluids rehydrate her, but don't put back potassium or B vitamins.

 

None was designed to replace all three, every day, in a bowl she wants to finish. That's where the sachet fits — alongside her plan, filling the gap between what she eats and what she loses.

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What You're Actually Buying

A cat who jumps onto the bed again.

 

A coat that feels soft, not thin and dry.

 

A weigh-in that holds steady.

 

You've watched her drink and fade at the same time. Now you're putting back what she's losing, not just the water.

 

What it takes: 1-2 sachets a day in a third bowl. No needle, no powder on her food.

 

How long: give it 3-4 weeks — that's why the guarantee runs 90 days.

 

If I'm wrong: send it back the empty box in 90 days, and they'll refund you.

Start Before the Next Weigh-In, Not After

You can't stop her kidneys from leaking. You can decide whether what leaks out gets put back — every day, on the days she looks fine.

 

New customers: Up to 50% off your first box + free shipping + free tote bag 

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Kayla Brooks is an Australian based vet nurse and lifelong cat owner. This article includes affiliate links; Fureeze provided product for review but did not approve the final copy. Always consult your vet before introducing a new supplement, especially if your cat is on medication, has pancreatitis, or is pregnant.

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