Royal Canin Veterinary Diet Urinary S/O is a complete wet food formulated for adult cats with diagnosed lower urinary tract disease. Sold as 85g pouches in a 12-pack, the diet targets both struvite and calcium oxalate crystals — two distinct crystal types requiring different nutritional approaches. A vet prescription or recommendation is required before feeding.

The formula works by modifying the urinary environment: controlled mineral levels and a low relative supersaturation (RSS) index reduce conditions that promote crystal formation, while remaining struvite crystals are targeted for dissolution. The wet food format is clinically relevant here — it naturally increases water intake, which dilutes urine concentration and reduces further crystal development. Cats are notoriously reluctant drinkers, so the food itself contributing to hydration matters.

Owners managing cats with recurrent urinary issues choose this diet because it addresses the underlying crystal chemistry rather than symptom management alone. The wet pouch format encourages the fluid intake that dry urinary diets often can't reliably provide — which is frequently where dry alternatives fall short in practice.