According to the U.S. Food and Drug Administration, “Xylitol (which also may be known as birch sugar or wood sugar) is a sweetener used in many foods and products for people (things like certain gum, sugarless ice cream, candy). Though safe for humans, xylitol can be deadly to dogs and other pets.”
Here’s a brief video from the FDA, warning pet owners of the dangers of xylitol and offering tips on protecting your dog from xylitol poisoning:
For details, including a more comprehensive list of products containing xylitol and more information on the danger the sweetener poses to dogs, read the FDA’s accompanying article, “Paws Off Xylitol; It’s Dangerous for Dogs.”