Hill's Prescription Diet u/d Urinary Bladder Health is a dry dog food for dogs prone to calcium oxalate, urate or cystine bladder stones — the harder-to-dissolve stones that can't be managed by c/d. The recipe is designed to reduce the conditions in the urine that allow these crystals to form.

Reduced protein limits the metabolic precursors of urate and cystine stones, controlled minerals lower oxalate stone risk, and added potassium citrate alkalinises the urine. Increased moisture promotes urine dilution, reducing crystal concentration. Antioxidants and omega-3 fatty acids support urinary tract health more broadly. Veterinary authorisation required for long-term feeding.

Vets prescribe u/d when stone analysis confirms oxalate, urate or cystine — typically after a stone removal surgery to prevent recurrence. Owners stick with it because the alternative is repeat surgeries, and the diet works when fed consistently.