My 4 year old female lab recovered from a UTI a couple of months ago. Since then we monitor her urine at the vet every few weeks. She is taking cranberry supplement and is currently on DL Methionine. Her test yesterday still showed a few crystals so vet upped Methionine. He said in a month or so we'll retest and look at prescription foods. I think the ingredients are terrible in Royal Canin, etc. Any ideas on what else might help? Maybe freeze dried kibble, frozen raw?