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without another c and s how will they know which antibiotic she should be taking? also she has a recessed vulva, do you recommend surgery to address that issue? and will it harm her that we stopped giving her the antibiotics before the 10 days were up and now starting them again?
I don't expect to be able to fully clear the infection without getting rid of the stones, so seeing an improvement in clinical signs on a broad spectrum antibiotic is a pretty good indicator that the one you've been using is sufficient. If you've already stopped the antibiotic, you might as well have it cultured before you start again, though, just to be sure. It won't harm her to have stopped and then re-start-- it just makes it more likely that the bugs in there are resistant to your antibiotic and you may need something different.
Repairing the recessed vulva is certainly a good way to help prevent UTIs (and formation of more stones) in the future. I'd recommend getting the stones resolved first. Whether your surgeon will be comfortable removing stones and doing a vulvoplasty at the same time or doing one and then the other depends on the surgeon, so when you establish a relationship with a new vet, it's something to bring up.
one more question, how long does she have to be off antibiotics before she can have another c and s?
could it be possible that she has ureaplasma bacteria that doesn't show up on a regular c and s? thus treating her for sterile stones would be wrong?