ROYAL CANIN® Urinary S/O Adult Dog Food

ROYAL CANIN® Urinary S/O Adult Dog Food
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12 x 100g
2kg
13kg
Loaf » 12 x 410g
Small Dog » 1.5kg

Images are for illustration purposes only. Packaging may change from time to time and images on our website may or may not be updated.

  • 12 x 100g £12.49
  • 48 x 100g £49.49
  • 2kg £20.50
  • 7.5kg £65.48
  • 13kg £80.45
  • Loaf » 12 x 410g £42.30
  • Small Dog » 1.5kg £16.10
  • Small Dog » 4kg £44.50

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Description

Royal Canin Urinary S/O Adult dry Dog Food

ROYAL CANIN® Veterinary Health Nutrition Since 1968, Royal Canin has been following the belief that nutrition plays a key role in supporting the health and wellbeing of cats and dogs. This is why we have designed ROYAL CANIN® veterinary diets around proven nutritional science in partnership with pet professionals and experts, delivering nutrition for pets with specific health needs.

For dogs with urinary sensitivities, a specially tailored diet containing precisely balanced nutrients can help to support good urinary health. ROYAL CANIN® Urinary S/O Dry dog food is specifically formulated with the nutritional needs of dogs with urinary sensitivities in mind.

This urinary food for dogs is suitable for dogs with:

  • Struvite uroliths: dissolution and management of recurrence.
  • Calcium oxalate uroliths: management of recurrence.

Key Benefits:
- Urine Dilution - ROYAL CANIN® Urinary S/O's exclusive complex helps to dilute your dog's urine, making it less likely for calcium oxalate stones and struvite stones to form in the first place.
- Struvite Dissolution - Struvite is a normal component of your dog's urine that can form crystals or stones if the urine is too concentrated. ROYAL CANIN® Urinary S/O helps to dissolve all types of struvite stones that may form in your dog's bladder.
- Low RSS - Relative Super Saturation (RSS) methodology is utilised for the development of ROYAL CANIN® Urinary S/O. RSS helps to lower the concentration of ion in your dog's urine, minimising the likelihood of bladder stones forming.
- Low Magnesium - As magnesium is also a natural component of struvite crystals, ROYAL CANIN® Canine Urinary S/O is formulated with a reduced level of magnesium.

As part of the ROYAL CANIN® Veterinary Health Nutrition range, it is important that this product is only given to your pet when recommended by a veterinary professional. To cater to each dog's individual preferences, ROYAL CANIN® Canine Urinary S/O is also available as wet food in either a delicious gravy or a soft and tasty loaf. If you're considering mixed feeding, simply follow our feeding guidelines to ensure your dog gets an accurate amount of both wet and dry food for optimal benefit.

Please note: ROYAL CANIN® Canine Urinary S/O dry dog food is not suitable for Chronic Kidney Disease (CKD), heart disease (when sodium restriction is sought), concurrent use of urine-acidifying medication, growth, gestation, lactation.

ROYAL CANIN® URINARY S/O dry is a complete dietetic feed for dogs, formulated for the dissolution of struvite stones and the reduction of struvite stone recurrence. Urine undersaturating or metastabilising properties for struvite and/or Urine acidifying properties. RECOMMENDATIONS: It is recommended that advice from a veterinarian be sought before use and before extending the period of use. Feed URINARY S/O dry for 5 to 12 weeks for the dissolution of struvite stones and initially up to 6 months for the reduction of struvite stone recurrence. The dog should be re-evaluated regularly by the veterinarian to assess the relevance of a lifelong recommendation. Water should be available at all times. In older dogs, renal function should be checked before recommending ROYAL CANIN® URINARY S/O. In older dogs, the use of Urinary S/O Ageing 7+ is recommended.

Feeding Guide

Dog weight (Kg) Thin Normal Overweight
2 54g 48g 41g
5 108g 95g 82g
10 181g 159g 138g
15 245g 216g 187g
20 305g 268g 232g
25 360g 317g 274g
30 413g 363g 314g
35 463g 408g 352g
40 512g 451g 389g
45 560g 492g 425g
50 606g 533g 460g
55 650g 572g 494g
60 694g 611g 528g
70 779g 686g 592g
80 862g 758g 655g

Ingredients

Maize flour, rice, animal fats, dehydrated poultry proteins, maize gluten, minerals, hydrolysed animal proteins, vegetable fibres, soya oil, fish oil, fructo-oligosaccharides, mono- and diglycerides of palmitic and stearic acids esterified with citric acid, marigold meal.

Additives

Additives (per kg)**: Nutritional additives: Vitamin A: 16000 IU, Vitamin D3: 1000 IU, Iron (3b103): 44 mg, Iodine (3b201, 3b202): 4.4 mg, Copper (3b405, 3b406): 14 mg, Manganese (3b502, 3b504): 57 mg, Zinc (3b603, 3b605, 3b606): 147 mg, Selenium (3b801, 3b811, 3b812): 0.06 mg.
**Values reflect only levels added to the formula, not those naturally occurring in components of the diet.

Analytical constituents

Protein: 18.0% - Crude fibres: 2.2% - Fat content: 17.0% - Crude ash: 6.6% - Calcium: 0.5% - Phosphorous: 0.5% - Sodium: 1.2% - Chloride: 2.3% - Potassium: 0.8% - Magnesium: 0.05% - Sulphur: 0.5% - EPA/DHA: 0.22%.

Royal Canin Urinary S/O Small Dog Adult Dry Dog Food

Ingredients

Rice, maize flour, dehydrated poultry proteins, animal fats, maize gluten, hydrolysed animal proteins, minerals (including pentasodium triphosphate (0.35%)), vegetable fibres, egg powder, wheat gluten**, soya oil, fish oil, fructo-oligosaccharides, marigold meal.
** L.I.P.: protein selected for its very high digestibility.

Additives

Additives (per kg)*: Nutritional additives: Vitamin A: 16000 IU, Vitamin D3: 1000 IU, Iron (3b103): 45 mg, Iodine (3b201, 3b202): 4.5 mg, Copper (3b405, 3b406): 14 mg, Manganese (3b502, 3b504): 59 mg, Zinc (3b603, 3b605, 3b606): 144 mg, Selenium (3b801, 3b811, 3b812): 0.06 mg Preservatives - Antioxidants..
*Values reflect only levels added to the formula, not those naturally occurring in components of the diet.

Analytical constituents

Protein: 20.0% - Crude fibres: 2.4% - Fat content: 17.0% - Crude ash: 7.3% - Calcium: 0.72% - Phosphorus: 0.7%- Sodium: 1.2% - Potassium: 0.8% - Magnesium: 0.05% - Chloride: 2% - Sulphur: 0.6%.

Royal Canin Urinary S/O Loaf Adult Wet Dog Food

Ingredients

Pork by-products, poultry by-products, wheat flour, sunflower oil refined, corn starch mixture, vital wheat gluten, powder cellulose, pork blood products, minerals, fish oil, marigold meal, yeasts and part thereof.

Additives (per kg)*:

Nutritional additives: Vitamin D3: 170 IU, Iron (3b103): 3 mg, Iodine (3b202): 0.16 mg, Copper (3b405, 3b406): 1.3 mg, Manganese (3b502, 3b503, 3b504): 1 mg, Zinc (3b603, 3b605, 3b606): 10 mg - Technological additives: Sodium bisulphate: 0.9g.
*Values reflect only levels added to the formula, not those naturally occurring in components of the diet.

Analytical constituents

Protein: 8.1% - Crude fibres: 1.0% - Fat content: 5.6% - Crude ash: 1.7% - Moisture: 79.0% - Calcium: 0.18% - Phosphorus: 0.16% - Sodium: 0.26% - Magnesium: 0.01% - Potassium: 0.15% - Chloride: 0.37% - Sulphur: 0.17%.

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All prices include VAT where applicable.

Reviews (76)

Summary of Reviews for ROYAL CANIN® Urinary S/O Adult Dog Food

Overall 5
Value For Money
Quality
Tastiness
Pet's Opinion
Nutritional Value
76 out of 76 (100%) customers would recommend this product.
5 stars (51 reviews)
4 stars (21 reviews)
3 stars (4 reviews)
2 stars (0 reviews)
1 stars (0 reviews)

Only verified purchasers of this product can leave a review.

Pebbles. Food
Verified Purchase

By Gail Todd on 28 November 2025

This food is for Pebbles who is on a special diet due to bladder stones, good quality food

Customer recommends this product

S/0 urual food as my dog has cyristals needed monthly
Verified Purchase

By Adam Pannett on 18 November 2025

Great product my staffy needs s/0 urinal food as got cyristals in his stomach food breaks them down alway arrive recommend this company desent prices n products

Customer recommends this product

1 person found this review helpful

Tasty Toppet
Verified Purchase

By Diane Andrews on 16 October 2025

Use this to add to my boys dry food, he enjoys it.

Customer recommends this product

My dog Nellie loves it!
Verified Purchase

By Debbie Staynes on 1 July 2024

Nellie is a fussy eater but couldn’t eat this food fast enough!

Customer recommends this product

STANDARD PACKAGE
Verified Purchase

By David Sale on 30 June 2024

This is a standard Urinary dog food which has been used, successfully, for the last five years. It helps to keep the pH level in the correct frame.

Customer recommends this product

1 person found this review helpful

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Q & A

Below are some recent questions we've received regarding ROYAL CANIN® Urinary S/O Adult Dog Food, including answers from our team.

6 April 2025 at 6:40pm

Struvite crystals

Jim Reid

Our small labradoodle has been diagnosed with struvite crystals in her bladder. We have been trying to get her to accept Royal Canin SO and have tried both wet and dry versions. However she refuses to have anything to do with either. She readily accepts her normal food which is raw minced chicken and tripe. We have been adding water to this in the hope that the water addition will in some way help with dilution of the crystals.
I am reluctant to be trying different prescription foods at random due to the cost and the fear of being left with a pile of tins and bags. Can you suggest an approach ?

  • VioVet Staff

Please see a vet regarding this as we cannot advise if your under vet care

15 November 2021 at 10:23am

Is this renal dog food

David Toop

is this renal dog food

  • VioVet Staff

This is a urinary veterinary diet. The Royal Canin Renal diet range can be found in the link here.
You should only use veterinary diets alongside your vets advice to ensure they are appropriate for your specific pet. There is a range of renal diets and the correct one for your pet will vary.

27 February 2021 at 8:33am

Recommended amount to feed my dog per day

Davina Lynch

I wanted to ask about the Royal Canin Urinary dog food. I have been purchasing the CD urinary wet food for some time. It seems as if they are not able to provide it anymore. I am thinking of purchasing Royal Canin instead. Can you please tell me how much they recommend I give to a dog weighting 12kg per day as I'm trying to weight up the prices?
Thanks

  • VioVet Staff

Any dietary changes regarding urinary diets should be run past your vet as there are different types of urinary food which are used to treat/prevent very different urinary disorders. Giving the wrong type of diet can worsen your dog's current urinary issue.

Royal Canin S/O should be fed at 188g per day to a 12kg dog of normal weight, split into however many feeds you are used to giving.

23 April 2018 at 5:14pm

What has happened to you?

Richard Bland

We were regular purchasers of Royal Canin dog food for more than ten years but you became suddenly more expensive, we then found Pets at Home to be significantly cheaper. Unfortunately we have now found we need the Urinary S/O LP18 and thought I'd check your prices out and find for a 14kg bag your price is around £20 more expensive than Pets at Home, are you aware?

  • VioVet Staff

Hello Richard,

Thank you for your question.

Unfortunately our prices are influenced by changes in the market and what we are charged by our suppliers, so sometimes they have to increase to match. We always reduce prices where we can to be as competitive as possible.

Hope this helps.

7 October 2015 at 8:25pm

BEST FOOD TO HELP A UTI

Samantha

Hello.
My 11 year old female cocker spaniel has been diagnosed with a UTI we need to increase her water intake but is proving difficult. Can u recommend anything that would help this?
Kind regards
Samantha

  • VioVet Staff

This is an interesting point and personally I would recommend not using any dried diet in a dog with this sort of problem. A dog is always playing catch-up with their water intake if they are on a dried diet. I suggest you use the wet versions of the food (tinned or pouches) and you can even add a little warm water to them and make the food a bit like a casserole. It is also worth keeping a bowl of rainwater in the garden if you can. Some dogs like to lap at "outside" water when they come across some, even if they are not really thirsty.

17 May 2015 at 10:48am

Royal canin so wet

Andrea Golden

  • VioVet customer since 2014
  • From: Lancashire, United Kingdom

Hi.. my 5 year old pug is currently on the day food and I was wondering if the wet food is also hydrolysed as the biscuits are? He has allergies and is okay on the dry small dog biscuits but I would like to add in some wet food also.. Thanks in advance

  • VioVet Staff

I believe that if your dog is allergic to pork, then this we food would not be suitable. Effectively that should be the only difference between the diets but it is difficult to be sure about these things. Many dogs have multiple allergies, though some of these are not true allergies and the apparent sensitivity can seem to disappear in time after a change in diet. I would say that if his allergies caused a huge amount of trouble for him, but now things are settled, then it would be sensible to stay with what you are doing and not add a new food. However if the problems were not that bad it would be worth testing him on a tiny amount of wet food and seeing if he tolerates it. I think it would be unusual for a dog to be OK on the dried from of this food but not the wet, as the dried contains many un-hydrolysed proteins and is not a try hypoallergenic diet like the fully hydrolysed types.

2 January 2015 at 8:20pm

U/C and S/O royal canine dry dog biscuits urinary

What is the difference between

Is there big difference in the dry food my dog has had gu stones crystal in his urine. His had the stones removed his a 7 yr old bulldog

  • VioVet Staff

S/O and U/C are intended for different types of crystal/stone in the bladder. Most dogs require S/O but this is something you should check with your vet about.

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