What happens if I kill the shepherd's sheep?

I just got a sword, and the shepherd made sure to tell me not to harm his sheep, and put up a helpful sign to remind me.

myself, the sign, my sword, and the sheep

This sheep has done nothing against me, yet all the pushing against it makes me tempted to attack this sheep. Is there a reason to kill or not kill this sheep.


There's an in-game "awardment" Anything For An Awardment is awarded for killing all the NPCs and sheep in the game. There's no negative side effect.

enter image description here