I am looking for any info on the correlation between the Ph level and kidney stones in Doxies. I have a 2 yr. old male who has already had kidney failure once and bladder surgery. About every 5-6 months he goes through this with an elevated Ph level (7.5 +) while he has been on Hill's s/d diet and IVD control formula. They seem to have stopped working. I just switched to a new vet for a second opinion and we have taken him off of the s/d and given him Methio-form along with the control formula. I would like to try all natural foods but am hesitant b/c I don't want him to make more stones. We can't put him through another surgery...it was just way too hard on him. But he is only 2 yrs old and just the love of our lives......Help! Any info would be greatly appreciated. I have recently read about Cranberry extract....any thoughts on that. I hope I am doing the right thing by putting him on this medicine, which I cant find too much information about other than where to buy it on the web. He has a history of making struvite crystals and currenty is stone free but I think they are just small and is passing them. He goes through these bouts of pain and vomiting about every 5-6 months as I said previously. Thanks in advance for any info.