Struvite dissolution

Helps dissolve all types of struvite stones.

Urine dilution

Urine dilution makes the urine less liable to form struvite and calcium oxalate stones.


Helps lower the concentration of ions contributing to crystal formation.

Low magnesium

Reduced level of magnesium, a natural component of struvite crystals.

ROYAL CANIN® Urinary S/O is for the nutritional management of cats with struvite or oxalate crystals and lower urinary tract disease. Recommended for (indications): Struvite uroliths: dissolution and management of recurrence, Calcium oxalate uroliths: management of recurrence. Not recommended for (contraindications): Chronic Kidney Disease (CKD), Heart disease (when sodium restriction is sought), Concurrent use of urine-acidifying drugs, Growth, gestation, lactation, Hypertension. In older cats and dogs, it is recommended renal function be checked before Urinary S/O is prescribed. This diet is complete and balanced and can be fed long-term. A full health check should be performed by a veterinarian every 6 months.
Composition: Rice, wheat gluten*, dehydrated poultry protein, maize flour, animal fats, hydrolysed animal proteins, minerals, vegetable fibres, maize gluten, fish oil, soya oil, fructo-oligosaccharides, marigold extract (source of lutein), wheat flour. *L.I.P.: protein selected for its very high digestibility.

Additives (per kg): Nutritional additives: Vitamin A: 21000 IU, Vitamin D3: 800 IU, E1 (Iron): 34mg, E2 (Iodine): 3.4mg, E4 (Copper): 10mg, E5 (Manganese): 44mg, E6 (Zinc): 150mg, E8 (Selenium): 0.05mg. Preservatives – Antioxidants.

Analytical constituants: Proteins: 34.5%, Fat content: 15%, Crude fibre: 2.9%, Calcium: 0.9%, Omega 6: 3.18%, Omega 3: 0.82%, EPA + DHA: 0.36%, Dietary fibre: 6.9%, Carbohydrates (Starch): 33.2%. Metabolisable energy: 387kcal/100g.

*L.I.P.: protein selected for its very high digestibility.
Cat's weightThinThinNormalNormalOverweightOverweight
2 kg39g4/833g3/826g 2/8
3 kg52g 5/844g 4/835g 3/8
4 kg64g6/854g 5/843g 4/8
5 kg75g 7/863g6/850g 5/8
6 kg86g 172g 7/857g5/8
7 kg96g1 + 1/880g7/864g 6/8
7.5kg101g1 + 1/884g167g6/8
8 kg105g 1 + 2/888g 170g6/8
8.5kg110g1 + 2/892g1 + 1/873g7/8
9 kg115g 1 + 3/896g1 + 1/876g 7/8
9.5kg119g1 + 3/899g1 + 1/879g7/8
10 kg123g 1 + 3/8103g 1 + 2/882g 1

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