I have a 3 yo male cat who presented with almost complete blockage due to crystals. My vet said that over the counter urinary tract health dry food is okay. My question is: What is the difference between Purina Pro Plan FOCUS and Purina ONE Special Care versions of the Urinary Tract Health foods? How do I know which one is the better option? What ingredients should I look for and look to avoid? Why is there ash (6%) in the dry food when my vet advised me to look for low ash (<2.5%) wet food?

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