Our expert says:
Best to have both of them neutered. It has been shown that if bitches are neutered before they have their first "season", they will be 200% less likely to get mammary tumours. Older bitches often develop uterine related diseases that can be exacerbated by the use of "contraceptive treatment" (tablets or injections). Older male dogs can develop testicular cancer and prostate problems if not neutered.
In males the testicles are removed and in females the uterus and ovaries are removed.
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