YSK: the artificial sweetener Xylitol, found in many common household items/food like toothpaste and even peanut butter, is extremely toxic to dogs. If your dog ingests even a small amount, they can die.
from /r/YouShouldKnow
YSK：人工甜味劑木糖醇存在於許多常見的家用物品/食品中，如牙膏甚至花生醬，對狗來說是非常有毒的。如果你的狗攝入了哪怕是少量的木糖醇，它們就會死亡。