Bad breath isn't just a sign of dental issues, it can also be a symptom of serious medical issues. Since the vet didn't say anything about dental disease when her teeth were recently checked, it's unlikely that this is just normal tartar build up. Something may have developed in the meantime, like an abscess, kidney disease, diabetes, digestive issues etc. At her age, she susceptible to any of these senior ailments.
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Holly, Misty & their friend, Jake, the dog.
Onyx, Callie May, Maggie & Kobi forever in my heart.
Yes, I know I need a new signature pic...someday...