Okay.... Something I noticed, and, since this system has been something people have wanted for a long time, I think it's worth asking about.
I noticed that whilst Oxen and Dogs are attacked on sight by guards, cats are not. I also, from what I can tell, notice that cats have higher Charisma scores.
Could it be that the lower charisma of the Ox and Dogs are lowering their OR past the threshold of attack-on-sight?
If so, would making certain animals not be attacked simply be a matter of buffing their Charisma? From what I can imagine it wouldn't take overly long to simply knock the charisma of domesticated animals up a few points.