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Well, as a educated guess, that is salivary staining. Yes, the saliva, if a dog licks one area enough, can literally stain the coat a brown color. This is common for pets with underlying allergies, and there paws can literally get stained a brown color. However, the concern now is if there is a secondary infection present in the vaginal folds which is exacerbating the licking.
So, this is definitely worth a veterinary examination and make sure the vet takes a close look in the vaginal folds for infection.
So, not a serious concern, but well worth a examination.
Hope that information helps
A urinary tract infection or vaginitis that is exacerbating the licking are definitely considerations.
It would not be unreasonable for the vet to recommend a urine test, even if there are no obvious symptoms of a infection like straining to urinate or urinating more often.
No. I actually think if you wait too long it is going to be more costly, and possibly more painful for her.
Better to tackle it now and understand what is going on. Sorry for th delayed reply but hope that clarifies.
I just don't see an effective or appropriate way to treat this situation since we don't know if the bladder is involved, if there is a active vagnitis,and addressing possible allergies.