Fruits Basket

Checked and didn't see a thread for this topic o.o
So I have a question for anyone who has read the whole series
How in the world did Ren(Akito's mom) sleep with Shigure(the dog)??
Did Shigure transform? Is Ren's blood (because she's Akito's mom) make her immune to the curse like the girls in the family who are cursed? o.o I have yet to figure this out and it's not spelled out (of course) in the manga. So What do you suppose makes this possible?

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Bestiality...

Actually I don't remember... but I do recall that I was able to come up for a reason. I don't think they explain it in the manga though.

I have no idea, probably a plot hole.

oh fuck the whole manga is finished already? damn i need to go finish it. I love Fruits Basket. aiee you spoiled me with your question but i won't -rep you for it.