Seriously? People still think furry characters are not animals? Of course, I'm not saying that means people who draw them abuse animals (in fact, nobody said that in the original conversation I think?), but honestly. If you think a character that resembles a realistic wolf or cat but stands on two legs isn't an animal then you have no idea what an animal is. Not only to mention that furry characters are organic beings that move around on their own free will, literally the definition of an animal, the word "animal" meaning "animated". As for aliens, pretty sure most furry OCs are Earthlings. Here's a definition from Urban Dictionary that should make it more clear.
The less-formal term for anthropomorphic animals, which are usually cartoon characters.
Lastly, I'm pretty sure it's up to us to decide whether or not our fursonas or OCs are animals, not anyone else besides the artist. As a furry myself, my OCs and my fursonas are all animals because I said so. That's that. None of them are aliens. Actually, you would be the alien.
(Also, do people forget the biological and scientific fact that humans are animals too, meaning that furry characters would basically be twice the animal that people think they aren't?)