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I am Dr. Snow, and I can try and assist you today with Shadow. I'm very sorry to hear about her kidney issues.
To answer your question, yes sour breath can be a sign of what we call azotemia, which is when the kidneys enzymes are elevated. Toxins build up in the body when the kidneys aren't working well enough to excrete them, and one symptom can be a sour odor to the breath.
Did your veterinarian determine the cause of the kidney disease? Kidney disease generally requires ongoing management, such as fluid therapy, anti nausea medications, antacid medications, and sometimes a special kidney diet.