Purina
purina.com## What is the purpose of the St/Ox Defense system in Purina Pro Plan Veterinary Diets?
The St/Ox Defense system in Purina Pro Plan Veterinary Diets is designed to create a urinary environment that reduces the risk of both struvite and calcium oxalate crystal formation. This is achieved through careful management of urinary pH and mineral content.
Last verified: 9/7/2025
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