Xylitol is a toxic artificial sweetener that can be found in sugarless gum, candy, baked goods, vitamins, and medications. It can cause life-threatening low blood sugar and liver toxicity in dogs. The document describes a case of a dog named Liza who had to be treated intravenously for 3 days after eating 30 pieces of sugarless gum containing xylitol. Xylitol produces toxins in the liver at high concentrations that can destroy liver cells. Liza was also prescribed a liver protectant drug called Denamarin to help block these toxins and promote liver healing. Signs that a dog may have ingested xylitol include lethargy, tremors, vomiting, not eating