As discussed here [Res] [180] Invulnerable sheep - citizen deaths! the sheep in Alpha r180 would indirectly attack footmen/workers on red alert. My suggestion is that every Halloween the “were-sheep” return and all the sheep became evil once again!
Just imagine the horror!
Yeah, just like Candledark! Though I think they’d look better with fangs. 
I’d rather see the were sheep included as a core game mechanic… Hearthling gets bitten… and then under certain circumstances transforms. I’d like to see it be honed as something special like an elite combatant, or elite defensive creature.