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Don't forget Félicette, the first, and so far the ONLY, cat launched into space: https://en.m.wikipedia.org/wiki/F%C3%A9licette

She also survived.

>Félicette was killed two months after the launch so that scientists could perform a necropsy to examine her brain.[29]

it was so wholesome up until that point

It's interesting the changes in tone in that article. Félicette was killed, but the other 11 cats were "euthanized".

Killed 2 months later to examine the brain.