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I am sorry to hear you are worried about Dori. I am a veterinarian and will do my best to help.
Has Dori been Xrayed, to see if she has bladder or kidney stones? That can be a cause of recurrent bladder infections.
Do you happen to have the culture reports that have been done? It would help to know if they always grow the same bacteria every time she has an infection, or if it is a different bacteria each time.
Have any supplements or diet changes been tried to prevent the infections? Cranberry and D Mannose can be helpful in preventing recurrent UTI. A diet that promotes a urine pH of 6.5 might also help, such as Royal Canin Urinary SO or Hills K/D diet.
Let me know what other questions you have, or if you have those culture reports. Rebecca
It sure would help to see the culture and sensitivity reports, to know what the bacteria is and what antibiotics were tested in the lab to be the best one for that particular "bug". If Zeniquin is not the first choice antibiotic for the particular bacteria, not the best "drug for the bug", then a few bacteria stick around after the antibiotics are done and then they come back again. Without seeing the reports, I do not have as much to go on as your veterinarian does.
Grain free diets are not the same as diets that are urine acidifying. I like grain free for diabetes and weight loss, but they would probably not make a change in the pH of the urine.
Your "UTI +" may be helpful; there are no clinical studies to support their claims. I usually use cranberry, and D Mannose especially if the infection is an E. coli.
You can find D Mannose and cranberry extract online or at pet stores or stores that sell supplements. They help prevent infections, but do not treat active infections.
Purina Pro Plan Urinary Health is a good diet, but the ones I trust he most are the Royal Canin SO and the K/D.
If this were my own cat, after all these tests and recurrences, I would finish antibiotics, wait about a week and do another culture (not just a urinalysis). If any "bugs" grow, I would pick the top choice antibiotic on the list, and stay on it for 6 weeks at least. If it is an antibiotic that makes her vomit, I would try probiotics, and giving it 1/2 hour after a meal. If she absolutely will not tolerate it, then I would try the number 2 antibiotic on the list.
Can I help with or answer anything else?
How is Dori doing?
Kindly consider rating my answer, if you found it to be helpful. You can still get back to me with updates and questions after rating. Hope you get this infection cleared up. Rebecca