I can say from experience that I am personally not happy with Purina Pro Plan or Purina One (almost the same exact food, one just costs more, the shapes are a little different & 2 ingredients are slightly different, got that right from Purina a couple years ago). So as long as they haven't changed their formulas in the last couple years and you are/want to feed Pro Plan you might as well save your money & feed Purina One.

Anyways:
Raustyk was on it for years (years ago when it first came out when it was a pretty decent food at the time). She had UTI infections litterally one right after another. Along with ear infections, anal gland problems and a weird skin rash thing. Once better foods starting becoming more available (Nutro, Innova etc..) I switched her and EVERYTHING went away.
She had numerous tests done, allergy, blood etc.... none showed anything food related but I beg to differ.
Since then I have found about 20 more people that had pet that had very similar symptoms on Pro Plan.

Then to top it off, the breeder I got Kaige from fed Pro Plan. He started to have very similar symptoms, red ears, frequent urination (no UTI though), anal gland problems and a weird skin rash thing. He is just about switched over to Innova Evo & ALL the symptoms are dissapearing.

So from my experience I have to say that I dislike Pro Plan & Purina One.

Edited to add, that Nanook was on it for years with Raustyk & he did do well on it.


It may or may not be food related. Is this a re-occuring UTI? If so I'd switch her food to something else, give it a few months (or however long it usually is until she is "due" for another UTI... as w/ Raustyk I could time it, it would be about 2 weeks after she finished her antibiotics from her previous UTI).
If this is her first UTI, I'd just keep her on the food (as long as it works for her otherwise), take her out when needed & wait & see. If it returns I'd then try to switch her to see if it helps.