3 Things Every Kidney Cat Owner Should Be Doing—But Most Miss No. 3

She’s still eating. She still purrs. She still curls up in the same sunny spot every afternoon. But kidney disease can keep progressing quietly, even on the days when your cat seems completely normal.

Here are three of the most important things you can do every day to support the kidney function she still has—not only when she starts looking unwell.

Updated 4 September 2026

Read time: 4 mins

Written by Megan Williams.

Cat lover of 20 years

There’s a reason caring for a cat with kidney disease can feel so confusing.

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One day, she’s drinking more than usual. The next day, she barely touches the water bowl. She eats her renal food for a week, then suddenly turns her nose up at it.

 

Because CKD usually progresses gradually, it can be difficult to tell whether something is helping—or whether your cat is simply having a good day.

 

The kidney tissue already lost to CKD cannot grow back. That means the goal of daily care is to support the kidney function your cat still has and help her stay comfortable for as long as possible.

 

So here are three parts of the routine worth focusing on, and all three can play an important role in supporting a cat living with CKD.

1. Get more water into her food—not only into another water bowl

Hydration is one of the most important parts of caring for a kidney cat.

 

Healthy kidneys concentrate urine and help the body hold on to the water it needs. As kidney function declines, cats lose more water through their urine and can become dehydrated more easily.

 

That’s why many kidney cats start drinking and urinating more.

 

A water fountain can help, but simply placing another fountain in the house doesn’t guarantee that your cat is taking in enough moisture.

 

One of the easiest ways to increase her daily water intake is through the food she already eats.

 

Whenever possible, choose a moisture-rich version of the renal diet recommended by your vet. You can also ask whether it’s appropriate to mix a little extra water into her meal.

 

Some cats prefer their food slightly warmed. Others will accept extra water when it’s mixed in gradually instead of turning dinner into soup overnight.

 

The important part is finding a method your cat will consistently accept.

 

Cats with more advanced CKD may also need fluids under the skin, but this should only be done under veterinary guidance.

 

The goal isn’t to make her drink an enormous amount at once. It’s to build more moisture into the small things she already does every day.

2. Pay attention to phosphorus—not only protein

When most owners start researching kidney diets, they immediately focus on protein.

 

But phosphorus is one of the most important nutrients to discuss with your vet.

 

Healthy kidneys remove excess phosphorus from the blood. As kidney function declines, phosphorus can begin accumulating and place additional strain on the body.

 

That’s why veterinary renal diets are formulated differently from ordinary adult or senior cat foods. They control phosphorus, protein, sodium and other nutrients together instead of changing just one number on the label.

 

Simply choosing a food labelled “senior,” “natural” or “high quality” doesn’t mean it is appropriate for a cat with kidney disease.

 

And trying to create a low-phosphorus diet at home without professional help can leave your cat short of protein, calories or other essential nutrients—especially if she is already losing weight.

 

Work with your vet to choose a renal diet appropriate for your cat’s CKD stage, blood results, appetite and body condition.

 

If she refuses it, tell your vet instead of allowing her to stop eating. The most nutritionally perfect food cannot help a cat who won’t touch it.

 

Phosphorus management is not about restricting everything. It’s about finding the right nutritional balance for the cat in front of you.

3. Make marine Omega-3s part of the daily routine

Omega-3s are another important nutritional component commonly included in veterinary kidney-support diets.

 

The two marine Omega-3s that matter most are EPA and DHA.

 

EPA and DHA help support a healthy inflammatory response and help manage inflammatory and oxidative processes that can place additional stress on already-compromised kidneys.

 

And there is feline research behind this. In a 2022 pilot study, five cats with early CKD caused by polycystic kidney disease received DHA-rich fish oil for 28 days and showed improvements in kidney-related markers including SDMA, UPC and urinary NAG.

 

A separate retrospective study also found that cats eating therapeutic renal diets containing higher levels of EPA tended to survive longer than cats eating other renal diets.

 

DHA also helps support brain and cognitive health—something that becomes increasingly important as cats get older.

Where Fureeze fits

We created Fureeze Fish Oil to make the daily Omega-3 part of a kidney-support routine easier to keep up.

 

Each daily serving provides 278mg of combined EPA and DHA from anchovy and Antarctic krill oil.

 

Anchovy provides a concentrated source of marine EPA and DHA, while krill oil naturally contains phospholipids that help support Omega-3 absorption.

 

Each serving also contains only 1.2mg of phosphorus, so it adds negligible phosphorus to a kidney-conscious routine.

 

Instead of storing the oil in one large bottle that is opened over and over again, every serving comes in an individually sealed Snap-Pack.

You snap it open, squeeze it over her food and mix.

 

No capsules. No measuring. No oily dropper. No bottle sitting open in the fridge for weeks.

 

Just one pre-portioned daily serving that fits into the food she already eats.

 

The point isn’t to promise that her kidneys will suddenly return to normal.

 

It’s to make one important part of her daily routine simple enough that you can keep doing it—on the difficult days and on the days when she still seems completely fine.

 

For most kidney-cat owners, the hope is simple: to support the kidney function she still has and help her stay comfortable, active and by your side for as long as possible.

Whether your cat has already been diagnosed with CKD or you’re looking after an ageing cat before obvious symptoms appear, Fureeze makes consistent marine Omega-3 support easier to add to her day.

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Megan Williams is an UK-based writer and lifelong cat owner. This article includes affiliate links; Fureeze provided product for review but did not approve the final copy. 

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