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It is a "real thing" in that I see people advocate for it fairly often on social media, and more rarely HN.

It isn't a real thing in that I haven't heard of any actual politicians advocating for it in the US. However, I just learned that mandatory pet

This [1] and this [2[, were top non-sponsored results when I google searched "manditory pet insurance".

I also noticed that Spain has introduced mandatory registration, liability insurance, and training classes for all dog owners in the country.