Your dog has a serious enough condition that requires prescription medication. Whatever you decide to feed her, add water and more water, offer frequent bathroom breaks. Keep the bladder flushed.
I would not only listen to your veterinarian, but where he has not managed to stabilize your dog as you inferred “recurring urinary tract infections”. I would ask him for a referral to a Veterinary Internal Medicine specialist and may an appointment as soon as possible.
Has your dog had x-rays? Lab work? Often dogs have bladder stones, they go hand in hand with urinary tract infections. There may be a genetic factor. I imagine your vet has recommended a prescription diet, which I would comply with.
I find this site helpful: http://skeptvet.com/Blog/category/nutrition/
I would be leery of homeopathic remedies and supplements, they can cause harm.
Have you tried the search engine here? From one of my previous posts:
Dogs that have experienced struvite bladder stones will often be fed a therapeutic diet for life. Diets lower in protein, phosphorus and magnesium and promote acidic urine are recommended. The preventative diet is NOT the same as the diet that promotes dissolution of the stones. In certain cases, medications to acidify the urine may be required. In addition, careful routine monitoring of the urine to detect any signs of bacterial infection is also recommended. Bladder x-rays and urinalysis will be performed one month after successful treatment, dietary or surgical, and then every three to six months for life. Dogs displaying any clinical signs of urinary tract infections such as frequent urination, urinating in unusual places, painful urination or the presence of blood in the urine should be evaluated immediately. Keep in mind that the greatest risk factor for developing struvite bladder stones in the dog is a urinary tract infection.
Above link is an excerpt from: http://www.michigananimalhospital.com/page/452425598
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