Xylitol is extremely dangerous for dogs. A minute amount may prove lethal -- as little as a few sticks of xylitol-sweetened chewing gum. Dogs absorb the sugar alcohol into their bloodstream quickly, which can trigger a massive insulin release. This insulin rush may lead to hypoglycemia, a profound decrease in blood glucose levels that can happen in less than an hour and is life-threatening if left untreated. Xylitol also contributes to fatal liver disease and seizures in dogs.

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