There are all sorts of explanations for anthro canons! The handwave, for example, which is my favorite; see Zootopia logic, where we just don't question the parallel evolution (because it's not important for the story at hand). In anthro-friendly roleplays like this one, there are good old humans, too, and they're just like everybody else.
Werefolk would be a good trope to invoke if you were writing something a bit more fantasy, just like how a lot of science fiction furry universes describe anthropomorphs as genetically re-engineered humans, or even aliens on occasion (though decidedly less often).
But this sounds like a modern setting, and since we don't have science or magic to explain furries, and since anthropomorphs are here presumably because the author wants them to be and not because they are some kind of plot device, I think the handwave is the best bet.