The Basics of Judaism: Basic Values and Morality: Neutering Pets:
Is neutering of pets forbidden?
The Biblical prohibition of neutering (Lev. 22:24) applies to all species.
The Talmudic sages disagreed as to whether it applies to both males and
females (Tosefta Makkos 5:6). The accepted view is that "indirect"
methods of neutering, e.g. drugs that cause sterility, can be used for
females but not for males.
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