Protein has to be converted to a dry matter basis (mathematically removing water content). Raw diets based almost exclusively on meat will be well over 20% protein.
OP, if the urine pH is high, then it is too alkaline. It would probably need to be acidified (but over acidifying can cause other problems). Struitrs are usually related to infection. O'd talk to your vet or a nutritionist about a diet formulated to regulate pH.
One of my dogs has a bladder problem. Then he started getting struvite crystals with a higher pH. We maintain on RC SO.
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