It's not because it walks on two legs, it's because these two legs species can talk LIKE A HUMAN, and COMMUNICATE LIKE A HUMAN. Just like someone pointed out its just like other fantasy creatures like Orcs, Elves etc.
It has nothing to do about "walking on two legs"
So Animals that can talk like Humans and behave like such dont count as animals ? So Disneys the Lion King is a movie about Humans and not Animals i guess ? You see where this is going right ? Just as i said: " A Dog is a Dog."
Also you just said Orcs and Elves are phantasy "Creatures". Creature and "Race" are two different things my friend. Orcs are in fact very human like given the fact that they are humanized Pigs and Pigs share similiar dna with us humans. In fact our DNA is 98% the same. Transplanting Pig organs into a human is common practice.
Now let me ask you this:
"An Animal with 98% human DNA is still an "ANIMAL". What chances do Furrys have not to be an Animal ?"
Thats exactly why its bs to allow animal sex just because said Animal can talk and walks on two legs. 2% my friend. 2% the Pig is off from being human and its still an Animal and a Dog that can talk and walk on two legs is seen as "Humanized" ? Yeah right thats a good excuse.
I am not fighting against Furrys or anything (Hell my Avatar is a "Furry" given on who you ask) i am just pointing out how stupid certain rules are nothing more and nothing less. It just makes no sense.