I think a switch to raw would be most beneficial...it certainly wouldn't hurt.
In addition, 2100mg cranberry supplements (we've used Natural Factors) 2x daily with meals. Your friends can get ph strips at any drug store so they can monitor the ph levels as often as they wish. Normal for dogs is 5.5-7. Lots of fluid is important as well. They can add 1/2 cup water extra to his food.
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"Education is a progressive discovery of our own ignorance." -Will Durant
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