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Good Morning and welcome to Just answer. I am Dr. Loretta, a licensed veterinarian and I am happy to answer your question.
Unfortunately, there is no home remedy that will cure this infection. The best thing you can do is purchase Methigel at the pet store which is a urinary acidifier that puts the urine in an acid state so the bacteria cannot grow. Give a dose of this every 6 hrs. This will not be curative but will reduce the number of bacteria and help ease his discomfort until you can get him to your vet for antibiotics.