There is a retrospective study if Goldens that showed that dogs spayed/neutered early have a higher incidence of Hemangiosarcoma, bloat, Osteosarcoma and torn cruciate ligaments. It's a retrospective study, just looking at past cases brought into a referral clinic. So it's validity is questionable. But most vets are now saying, if possible it's best to wait until at least 1 year before sterilizing. Hormones do have a purpose.
But if you are unable to be positive that a mismating won't happen, spay your girl.
It comes down to personal life choices, preference and your families well being and ability to manage an intact animal.
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