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I have always had and always been advised to let girlies have 1 season before they are spay. I have had 3 female dogs over the years and always done it 3 months after.
However, when I registered at the vets and gave the details the woman was rather alarmed that I was waiting to get Kassi spay and then told me that getting them done before 1st season reduces the risk of breast cancer (not sure if she was talking about me or the dog lol).
So, before or after first season?