Assertion: castration's risk | /r/HasProperty | reduced to 0.35%—a 99.5% reduction
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text: The incidence of mammary tumours in un-spayed female dogs is 71% (of which approximately 50% will be malignant and 50% will be benign), but if a dog is spayed before its first heat cycle, the risk of developing a mammary tumour is reduced to 0.35%—a 99.5% reduction.