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Royal Canin Feline Veterinary Diets Renal Special RSF 26 Cat Food

Royal Canin Feline Veterinary Diets Renal Special RSF 26 Cat Food Royal Canin Feline Veterinary Diets Renal Special RSF 26 Cat Food Royal Canin Feline Veterinary Diets Renal Special RSF 26 Cat Food
Dry » 500g Bag Dry » 500g Bag Dry » 500g Bag

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  • Dry » 500g Bag £7.00
  • Dry » 2kg Bag £24.49
  • Dry » 4kg Bag £41.50

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Royal Canin's Renal Special (RSF 26) is a complete food for cats that suffer with chronic renal insufficiency. It has been formulated to maintain and support healthy renal function and reduce the formulation of oxalate stones.

The Renal Special recipe provides a new texture, taste and aroma to the original dry Renal diet, to help keep your cat from losing interest in their food.

The very low phosphorus content prevents retention which can lead to secondary hyperparathyroidism and renal failure. The food contains a synergistic antioxidant complex which will help boost your cat's natural defences, maintain healthy cells and DNA, and neutralise free radicals.

Omega 3 long chain fatty acids help support a lower glomerular pressure which will help to prevent GFR. Additionally, an increase in uraemia often causes the development of gastric or intestinal mucosal ulcers. This will be prevented with added FOS and zeolite.

 Royal Canin veterinary dients should only be given in conjunction with your vets recommendation!

Product Kibble RSF 26

RENAL SPECIAL is a complete dietetic feed for cats formulated:

  • to support renal function in the case of chronic or temporary renal insufficiency, through its low level of phosphorus and high quality protein
  • to reduce oxalate stone formation, through its low level of calcium and vitamin D, and its urine alkalising properties


  • Chronic renal insufficiency (CRI)
  • Management of calcium oxalate urolith recurrence in cats with impaired renal function
  • Prevention of recurrence of urolithiasis requiring urine alkalinisation urate and cystine uroliths


  • Pregnancy
  • Lactation
  • Growth


  • Enhanced Palatability - Enhanced palatability helps stimulate feeding in cats with renal insufficiency
  • Low Phosphorus - A low phosphorus intake is key to help support renal function in cats with chronic renal insufficiency
  • Vascular Support - Nutrients that help support good renal filtration
  • Digestive Security - Nutrients which support a balanced digestive system



Maize flour, rice, dehydrated pork protein*, animal fats, maize gluten, vegetable fibres, hydrolysed animal proteins, wheat gluten*, minerals, beet pulp, fish oil, soya oil, fructo-oligo-saccharides, marigold extract (source of lutein).

Nutritional additives (per kg)

Vitamin A: 22000 IU, Vitamin D3: 800 IU, E1 (Iron): 49 mg, E2 (Iodine): 3.8 mg, E4 (Copper): 11 mg, E5 (Manganese): 64 mg, E6 (Zinc): 212 mg, E8 (Selenium): 0.07 mg - Preservatives - Antioxidants.

*L.I.P.: protein selected for its very high assimilation.


Analysis table Amount
Arachidonic acid (%) 0.05
Ash (%) 6.1
Biotin (mg/kg) 3.24
Calcium (%) 0.6
Fibre (%) 5.0
Dietary fibre (%) 10.2
DL-methionine (%) 1.12
EPA/DHA (%) 0.42
Fat (%) 17.0
Linoleic acid (%) 3.05
Lutein (mg/kg) 5.0
Metabolisable energy (calculated according to NRC85) (kcal/kg) 3769.0
Metabolisable energy (measured) (kcal/kg) 3998.0
Methionine Cystine (%) 1.41
Moisture (%) 5.5
Nitrogen-free extract (NFE) (%) 40.4
Omega 3 (%) 0.79
Omega 6 (%) 3.21
Phosphorus (%) 0.44
Protein (%) 26.0
Starch (%) 35.2
Taurine (mg/kg) 2100.0
Vitamin A (UI/kg) 25000.0
Vitamin C (mg/kg) 200.0
Vitamin E (mg/kg) 600.0
Other nutrients Amount
Arginine (%) 1.69
L-lysine (%) 0.95
Minerals Amount
Chloride (%) 0.65
Copper (mg/kg) 15.0
Iodine (mg/kg) 3.8
Iron (mg/kg) 175.0
Magnesium (%) 0.06
Manganese (mg/kg) 76.0
Potassium (%) 0.9
Selenium (mg/kg) 0.07
Sodium (%) 0.3
Zinc (mg/kg) 241.0
Vitamins Amount
Choline (mg/kg) 2300.0
Folic acid (mg/kg) 12.2
Vitamin B1 Thiamin (mg/kg) 14.2
Vitamin B12 Cyanocobalamin (mg/kg) 0.15
Vitamin B2 Riboflavin (mg/kg) 51.3
Vitamin B3 Niacin (mg/kg) 162.3
Vitamin B5 Pantothenic acid (mg/kg) 57.1
Vitamin B6 Pyridoxine (mg/kg) 42.5
Vitamin D3 (UI/kg) 800.0

Feeding guidelines

The following table shows the recommended feeding amount in grams per day. Ensure a supply of fresh drinking water is available at all times.

Cat's weight Lean Normal Overweight
2 kg 39 g 32 g -
3 kg 52 g 43 g -
4 kg 64 g 53 g 42 g
5 kg 75 g 62 g 50 g
6 kg 85 g 71 g 57 g
7 kg 95 g 79 g 63 g
8 kg 104 g 87 g 69 g
9 kg 113 g 95 g 76 g
10 kg 122 g 102 g 81 g

Need help or advice? Contact us:

  • Landline: 01582 842096
  • Mon - Fri: 8:00am - 6:00pm
  • Sat: 9:00am - 1:00pm
  • Email: [email protected]

All prices include VAT where applicable.

Reviews (20)

Summary of Reviews for Royal Canin Feline Veterinary Diets Renal Special RSF 26 Cat Food

Overall 5
Value For Money
Pet's Opinion
Nutritional Value
20 out of 20 (100%) customers would recommend this product.
5 stars (16 reviews)
4 stars (4 reviews)
3 stars (0 reviews)
2 stars (0 reviews)
1 stars (0 reviews)

Only verified purchasers of this product can leave a review.

45 Vital part of Hester's Renal diet
Verified Purchase

By on 14 April 2020

A good product for cats who need a renal diet. Hester enjoys the biscuits.

Customer recommends this product

55 Molly's loves it.
Verified Purchase

By on 6 March 2018

I bought a small pack of the '26' as Molly was eating the '23' with vigour, but she loves them. Small enough pieces for her too. The profile said tasty hence buying them as renal food is known to be bland.

Customer recommends this product

55 My cat loves it !!
Verified Purchase

By on 24 September 2017

I have a very fussy 14 yr old cat who has turned her nose up at every other food for chronic kidney disease, but not this one!!
She absolutely loves it !!!

Customer recommends this product

55 Good for older cats
Verified Purchase

By on 26 April 2017

Adbvised to try by our vet. Our very old, 21 year old, cat has poor appetite and CKD, but she enjoys this dry food a lot.

Customer recommends this product

55 so relieved to have found this renal food!
Verified Purchase

By on 18 September 2016

This is the very favourite food of my little Burmese cat. She has only one kidney and that is not working so well but thisRoyal Canin Special food she loves and has even put on weight, which is the aim.I am so pleased with it and relieved to have discovered it after a couple of years trying everything I could .

Customer recommends this product

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Q & A

Below are some recent questions we've received regarding Royal Canin Feline Veterinary Diets Renal Special RSF 26 Cat Food, including answers from our team.

3 October 2018 at 11:35am

Different names?


What is the difference between the RF, RS and RSF brands of cat food?

  • VioVet Staff


Thank you for getting in touch.

I have had a response from Royal Canin regarding your question.

They said:

We have three Renal dry diets available; Renal (RF23), Renal Special (RSF26) and Renal Select (RSE24). We know that cats with renal disease often go off their food so we have developed a range of foods with different flavours, textures and aromas that all provide the same level of support for your cat.

Renal Special and Renal Select contain pork as the protein source, whereas we use vegetable protein as the main protein source in the Renal diet. Pork has a low mineral content which helps to enhance the palatability and also increase the digestibility. Both the Renal Special and Renal Select have a slightly higher protein content than the Renal diet, but this is still fine for cats with renal disease, as we use a highly digestible protein. The higher protein also helps to enhance the palatability of the food. The Renal Select has a double texture, pillow kibble which is designed to make the kibble more palatable.

All three of the diets are formulated to support renal function in cases of chronic kidney disease and have an adapted content of high quality protein which helps reduce the kidney's workload. They contain EPA and DHA, a complex of antioxidants and a low phosphorus level.

Hope this helps,


28 October 2015 at 1:00am

Royal canning and ipikatine

Janice Lancaster

  • VioVet customer since 2015
  • From: West Yorkshire, United Kingdom

Do I need to put phosphate binder on royal canning renal special? Also is it OK to syringe feed the kibbles after soaking.Thank you

  • VioVet Staff

Hi Janice, it would be perfectly okay to soak the kibbles and syringe feed if your cat is having difficulty eating. There is also a wet variety available here which, if your cat is able to eat wet foods, might be an easier option for you.

The diets have been developed to be low in phosphorous, but providing additional support with Ipakitine would not not be a bad idea, as it also has the ability to bind uraemic toxins and block their absorption. It would work with the diet to greatly reduce the strain on the kidneys, and help to prevent phosphorous and toxin build-up.

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