Katia = Anthropomorphic
Furry = Someone who likes anthropomorphic art
furries are both described as the people who are part of the fandom, and as the characters depicted within the fandom
(And is only a furry if they choose to call themselves that.)
This is something entirely separate and is fairly debated.
Furry is an interest in anthro animals, and in my opinion, if someone has an interest in anthro animals large enough that they're always looking at them and drawing them, then they're a furry, people who do this and deny being a furry are either in the closet (as stupid as it is for a fandom) or there's something about the fandom they don't like (being thrown in with the generalizations, or even believing the generalizations themself, perhaps?) .