>>3059304 When it comes to works of fiction, I've come to believe that there's a difference between the furry category (which include non-human animal characters) and furry genre (where the story is about the differences between human and non-animals, or different types of non-human).
Of course, it's a gradient, but in general a furry category work may include detailed descriptions of the characters but they otherwise have no real impact on the story, which belongs to other genres (e.g. 'Circles' is a furry [category] comic within the gay slice-of-life/romance genre).
Within a furry category work, the species chosen might hint at a character's personality, but it wouldn't mean they are particularly more or less capable in various ways, have seriously different mental attributes, etc.
Conversely, in a furry genre work, the story revolves in part around the furry nature of the characters, which will likely be contrasted with non-furries, different species, or different levels of anthropomorphism. Phil Geusz's Lapism work would be a good example of this. (Of course, those works often belong to other genres as well.)