XYLITOL
Many people think that xylitol is an artificial sweetener, but it’s not, and that’s a problem in so far as understanding a label. Due to it being a natural part of fruits and veggies, it might be listed as “natural sweetener“, or “sweetened naturally”
Some nut butters (not just peanut butter) have changed to include xylitol, a natural alcohol sweetener. Xylitol is poisonous to dogs, causing liver failure and dangerously low blood sugar.
Note: Not all natural alcohol sweeteners are a health risk for dogs, but if all the label states is “sugar alcohol” without stating which one, you’ll want to keep it away from dogs.