Breakdown of funinkyoseishujutsu ga owatta.

Questions & Answers about funinkyoseishujutsu ga owatta.
It is a compound noun meaning spay/neuter surgery.
A rough breakdown is:
- 不妊 = infertility / sterilization
- 去勢 = castration / neutering
- 手術 = surgery / operation
Put together, 不妊去勢手術 is a general veterinary-style term for the surgery that prevents reproduction. In practice, it often covers both spaying and neutering as one category.
が marks 不妊去勢手術 as the subject of the verb 終わった.
The verb 終わる is an intransitive verb, meaning it describes something ending or being over, rather than someone actively finishing it.
So:
- 不妊去勢手術が終わった。 = The spay/neuter surgery ended / is over.
The sentence focuses on the event itself being finished, not on who finished it.