There's a class of avatar in Second Life called tinies (pulral of tiny). They are anthropomorphic animal avatars that are tiny, typically no taller than a man's knee. There's a whole world dedicated to tinies, including all sort of av based on different animals or even anime mechas, sims, parks, attires, animation overides and postures, all specifically designed for tinies.
above: A hedgehog↗ and a squirrel↗ (by Wynx Whiplash), and a Lego Star Wars (Lego theme)↗ figure.
above: Some toonish tinies.
above: “Skeleton Boy” by Karshr Demonia.
above: A Husky↗ and his mistress.
above: CAD↗ styled dragon and a dragon tiny.
above: A dragon lady, a kitty furry, and a dragon tiny.