We actually had a thing about this in the Shengui Guo plot - that our anthro 'pets' were relics of the spirit world, with spirit energy elevating quadrupeds into having higher (or at least, different) forms of intelligence and understanding. And walking in a more human form. Which is why there are so few of them - as Shengui Guo was shut off for so long.

Personal headcanon is that higher exposure to the Spirit World can affect pets in different ways, and particularly affect their offspring. Our Subetapedia tells of pets in their 'base' form, and how the majority of those types of creatures in the Subetan world behave - but there will always be outliers (which are the ones I feel are the most interesting to write stories about)

(The jobs center irion and the scratchcard malticorn DO need revamps, as does Selina the healer actually but hers is being worked on whereas the others aren't yet!)

- Well, it was explained that Shengui Guo has only been hidden for many years, it didn't just come into existence suddenly! It was behind a veil. So anthro pets like the pirates, Bonesy, Alexander - they're all descendants of once residents of Shengui Guo, or even just creatures that had passed through there.

Euclid was turned into a wyllop by Ian Asmodeus as a mad science prank!

If pets had tried to get rid of the offspring, the human owners may have stopped as many as they could - but still not enough for there to be a huge population of them. Subeta's wilderness isn't full of feral children! There would likely be some form of service/group of people that would rehabilitate any of these types of creatures.

I imagine there are other ways of anthro creatures existing (as Euclid existed in wyllop form) - but this is our established canon at this time.

- Anthro 'pets' (I've always wanted to change that word on here to something else, as I don't think the word 'pets' fully describes what these creatures are to us, or to themselves) marry whomever they please if they do even believe in marriage. I'm not here to speculate on those mechanics, I leave that up to interpretations - we have one anthro couple who have had children, and they are coincidentally the same species.

- seems like a really good reason to become a pirate, to be honest! A lot of anger and feeling out of place in society. And yes, I do think that there is a lot of cruelty and unpleasantness in the making of a world.

Gosh, now you have me thinking about Captain Jacques origin story.

- Haha, I slipped there on my generalisations! I don't like to give lore that specifically kills any kind of creativity. I love the stories made from the snippets we give, so I should amend that to 'Authorities would like to have you believe that the wilds are not full of feral anthropomorphic children'!

- I'm not 100% sure, but I believe that was written before we had human avatars - so it would have been an event for your pet. Originally, your main pet was actually...you? Kind of? Very undeveloped time of Subeta!