First of all, there is nothing wrong with Goofball World. It’s among my favorite vacation spots.
Second, the thing about animals having souls is tricky. Suffice it to say, they don’t have
human souls or anything directly comparable.
CCC 2258 says, “‘
Human life is sacred because from its beginning it involves the creative action of God and it remains for ever in a special relationship with the Creator, who is its sole end.’”
CCC 2262 adds, among other things, “The deliberate murder of an innocent person is ravely contrary to the dignity of the human being, to the Golden rule, and to the holiness of the Creator.”
I don’t think the Catechism has a werewolf section, but from the part on the 5th commandment (see exerpts above) I think it’s specific to humans.
Now for a animal to be able to commit sins, it must have a concept of sin and know that killing is wrong.
People kill animals every day and that’s not wrong because animal lacks the inherent worth that H. Sapiens has been given.
Animals kill people and technically that’s wrong because, a) humans have no natural predators and b) humans have inherint worth above and beyond that of the usual prey species. However, I’m not so sure it’s
morally wrong–and I’m sure it’s not a sin–because to be capable of sinning one must know that something is wrong and do it anyway. Animals can’t even grasp whether something is wrong or not, at least on the human level. Thus they’re off the hook.
That also means a werewolf would be off the hook, if the human consciousness was not in control: the CCC says urder is a deliberate act. However, one would still be obligated to do what he could to prevent his werewolf self from hurting anyone.
Essetially, I think I just re-stated everything Smber2c just said.

Um… yeah.
And Zooey, I’m sure there are enough werewolves for us to share. Maybe we could work out a time share agreement?
