This should be posted in /c/anime but I expect most people in /c/anime not being ethical vegans or even not having full visibility or answers.
The only series which satisfied me at certain point was Beastars, which I finished in manga, and I don't know any other series.
In the case of faulty animated series, Manga is also accepted in english at least.
It's not anime but the animated film Plague Dogs covers the quest to escape an animal testing facility of two dogs by the people who animated Watership Down and it's sad as hell.
And literally that one quote from Ghost In The Shell 2: Innocence
That's all I can think of. There are characters who mention they don't eat meat offhand sometimes, but that's about it. The people who make anime don't seem to want to ever actually touch real politics so you get maybe vague allusions at best.
Sad ;-;