Is there a reason your vet wants to spay her at 5 months old? I only ask because of the teeth problem. With the smaller ones i like to wait until their adult canine teeth are in so if they grow in behind the baby teeth then the teeth can be pulled at the same time as the spay. This way they won't have to be put under again in a few month to pull the teeth out.
i understand you not wanting her to go into heat first but typically the smaller dogs don't go into heat until 8-9 months old, sometimes later. So waiting till they are 6-7 months old for a spay is ok.
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