With questions on medical issues we are not medically qualified to answer such questions. However here are some  links to blogs and articles that you may find useful to enable you to make a more educated decision with diet.

Please do visit your vet for diagnosis and treatment.

https://www.dogsnaturallymagazine.com/kidney-failure-in-dogs-natural-treatment-options/

https://healthypets.mercola.com/sites/healthypets/archive/2016/06/22/dog-kidney-failure.aspx

https://products.mercola.com/healthypets/bladder-health-for-pets/

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