Warning: Xylitol is extremely toxic to dogs. Any known or suspected xylitol ingestion warrants immediate veterinary contact. Do not wait for symptoms. Use the Toxicology Specialist for immediate AI guidance on xylitol ingestion risks.
Xylitol is a five-carbon sugar alcohol used as a sugar substitute in countless human products. In dogs, xylitol triggers rapid, massive insulin release from the pancreas. Unlike in humans, canine pancreatic beta cells recognize xylitol as glucose, leading to profound hypoglycemia within 30–60 minutes of ingestion.
Clinical signs of hypoglycemia include vomiting, weakness, ataxia, collapse, and seizures. Without treatment, hypoglycemic brain injury can be fatal. Blood glucose should be monitored every 1–2 hours for at least 12 hours post-ingestion.
At higher doses (typically above 500–1000 mg/kg, though individual variation exists), xylitol causes acute hepatic necrosis. The mechanism involves depletion of adenosine triphosphate (ATP) and generation of reactive oxygen species. Hepatic failure may develop 24–72 hours after ingestion, even when hypoglycemia has been successfully managed.
| Dose (mg/kg) | Expected Effects |
|---|---|
| 75–100 | Mild hypoglycemia possible |
| 100–500 | Hypoglycemia likely; treat aggressively |
| 500–1000 | Hypoglycemia + hepatotoxicity risk |
| >1000 | Severe hypoglycemia; hepatic failure likely |
Xylitol is found in sugar-free gum, mints, candies, baked goods, peanut butter, protein bars, oral care products (toothpaste, mouthwash), nasal sprays, and some medications. Peanut butter is a particularly dangerous source because many owners use it to administer pills or as a treat—always verify the ingredient list. Use the Nutrition Label Scanner to scan product labels for hidden xylitol.
Products may list xylitol under alternative names such as birch sugar or wood sugar. When in doubt, assume xylitol is present in sugar-free products.
Decontamination
Induce vomiting with 3% hydrogen peroxide (1 mL/lb, max 45 mL) if ingestion occurred within 30–60 minutes and the patient is asymptomatic. Apomorphine is an alternative. Do not induce vomiting if the patient is already symptomatic (seizuring, obtunded).
Hypoglycemia management
Administer intravenous dextrose (0.5 g/kg as 25% solution diluted 1:1) as a bolus. Follow with 2.5–5% dextrose constant rate infusion to maintain blood glucose above 80 mg/dL. Monitor every 1–2 hours.
Hepatic support
For high-dose ingestions, initiate N-acetylcysteine, S-adenosylmethionine (SAMe), and milk thistle. Monitor liver enzymes and coagulation parameters for 72 hours.
Hospitalization
Admit for minimum 12 hours for hypoglycemia monitoring; 72 hours for hepatotoxicity risk cases.
- Xylitol causes rapid hypoglycemia within 30–60 minutes in dogs.
- Doses above 500–1000 mg/kg risk hepatotoxicity 24–72 hours post-ingestion.
- Check peanut butter and all sugar-free products—use Nutrition Label Scanner.
- Emergency protocol: decontamination → hypoglycemia management → hepatic support.
- Call poison control (ASPCA or Pet Poison Helpline) immediately—do not wait for symptoms.