Hill's Prescription Diet u/d is a veterinary wet food for adult dogs formulated to reduce the risk of urate and cystine urinary stone formation. Available in 370g cans, it provides targeted urinary support for dogs diagnosed with these specific stone types. A veterinary prescription is required — this is clinical nutrition, not general wellness food.

The u/d formula manages the dietary precursors that contribute to urate and cystine stone development, controlling protein levels and urinary pH to reduce the conditions favourable to crystal formation. The wet format inherently increases water intake, which is clinically relevant for urinary health management. The formulation was developed by Hill's nutritionists and veterinarians and is backed by clinical research.

Owners managing dogs with urate or cystine urolithiasis use u/d as the dietary component of a vet-directed treatment plan. The wet food format tends to be well accepted, which matters for dogs that need to maintain consistent intake over extended treatment periods.