Yes — xylitol is arguably the most dangerous common food toxin for dogs, because it's potent and hidden in everyday products: sugar-free gum, mints, many peanut butters, baked goods, and 'keto'/low-sugar foods. In dogs it triggers a massive insulin release. A single piece of some sugar-free gum can contain enough to harm a small dog.
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Hypoglycemia (dangerously low blood sugar) can occur at roughly 0.1 g per kg of body weight, and liver failure at around 0.5 g/kg. Because products vary so much in xylitol content, there's no safe "just a little" — treat any known ingestion as an emergency.
Sugar-free gum and mints are the most concentrated common sources, but it also turns up in many peanut butters, baked goods, some toothpastes, and low-sugar/keto-marketed foods. Always check the label before giving your dog peanut butter or anything sugar-free.
Call your vet or poison control immediately — this is a genuine emergency, not a wait-and-see situation. Symptoms (vomiting, weakness, collapse, seizures) come from a sudden insulin surge and can appear within 30-60 minutes.
Educational only — not veterinary advice. Always work with your vet, especially if your dog is on medication.
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