I was originally going to have our Eva spayed at 6 mos but something told me to dig a bit and research the reasons to wait. From what I have read and learned, I think waiting for a least one heat cycle is the most natural way to go. I know a lot of people cite percentages for tumor risk, but there are other risks as well when you don't let nature properly mature a dog. I would suggest searching the web for journal articles and papers written on the negative impacts of pre-heat spaying, I am so glad I did.
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Mary
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