Nin reporting for duty! (Super Mario AU)

So, when I discovered that an Shibe Nintendog made a canonically appearance in Super Mario Odyssey I just had to incorporate them into the AU!

I'd like ya'll to meet Nin, the private detective of Metro Kingdom! He isn't technically a CASO (Council Alliance Special Operations) affiliate but he works closely with the organization, often tasked with investigating disappearances they can't actively work with. This happens often enough due to CASO agents often being tasked with confronting Pirates, so Nin often has his paws full!

He's rather serious and very good at his job; he's got a nose that can track anyone on the coldest of trails! But don't let his severe look fool ya; he's a complete sucker for scritches and as embarrassing as it might be, he loves a good game of fetch. uwu

As for his species, he's a Nintendog! And Nintendogs are what I'm calling a Companion race. As a refresher, Companions are animals with human-level intelligence. This generally means that while they don’t necessarily have their own kingdoms, they usually reside in simplistic societies with clear structure and culture, and as such they are considered sapient. Companions typically aren’t able to speak (or if they do, it’s extremely limited due to their vocal range) but can very clearly communicate regardless through other means, whether it be through universal form of Sign Language or some other way.

-Nintendogs are highly evolved animals that look a lot like our dogs but they are generally larger, and have evolved to be able to stand (and move around) on their back legs. They are simple-minded creatures however they are rather intelligent with a level of sapience to them, and like Yoshis they have their own native island, way of living, and culture.

-Nintendogs come in wide array of sizes, but basic classification is: Small, Medium, Large, Giant. The smallest breed of Nintendogs stands about the same height as a Toad, whereas the Giant breeds can be as large as your average human man.

-Nintendogs cannot speak despite their intelligence and so communicate with others outside their kind in two separate ways: one is a modified form of sign language, given their paws aren't as dexterous as hands despite them having flexible dewclaws. The second is through a very simplified code language, "Woofish", which consists of a small series of barks, growls, and chuffs to cover basic language necessities, things like "yes, no, hello, goodbye" and so on.

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I might make an OC Nintendog or use an existing character to turn into a Nintendog that be specifically for Pauline's bodyguard! If I do, what breed should it be? O: