Xylitol is an artificial sweetener that triggers a massive insulin release in dogs, causing life-threatening hypoglycemia (low blood sugar). At higher doses, it causes acute liver failure. It's found in hundreds of products — gum, peanut butter, candy, vitamins, and toothpaste.
Why Is This Toxic to Dogs?
When dogs consume xylitol, it's rapidly absorbed into the bloodstream and mistakenly triggers the pancreas to release large amounts of insulin — far more than the amount of sugar consumed warrants. This causes blood sugar to plummet dangerously low.
At doses above 0.1g/kg, xylitol causes hypoglycemia. At doses above 0.5g/kg, it can cause acute hepatic necrosis (liver cell death). Gum containing xylitol can have 0.3–0.4g per piece — meaning just 2–3 pieces can be dangerous for a small dog.
| Product | Xylitol Content | Dangerous Amount | Risk Level |
|---|---|---|---|
| Xylitol Gum | 0.3–0.4g per piece | 2–3 pieces for 10 lb dog | EXTREME |
| Sugar-free candies | Variable (check label) | Check mg on label | EXTREME |
| Xylitol peanut butter | Varies by brand | Even small amounts | EXTREME |
| Vitamins / supplements | Often high content | Check dosage | HIGH |
Symptoms to Watch For
Watch for these signs and call your vet immediately if any appear:
Rapid Onset
Xylitol is absorbed within 30 minutes. Hypoglycemia can begin almost immediately.
Hypoglycemia Signs
Weakness, vomiting, tremors, loss of coordination. This is a medical emergency.
Liver Toxicity Risk
At higher doses, liver damage begins. Jaundice, bleeding disorders possible.
Liver Failure Risk
Without treatment, acute hepatic necrosis can be fatal within 48 hours.
🚨 What To Do If Your Dog Was Exposed
Frequently Asked Questions
Hypoglycemia occurs at doses of 0.1g/kg. Liver failure risk starts at 0.5g/kg. A 10 lb (4.5 kg) dog needs just 0.45g for hypoglycemia — that's about 1–2 pieces of xylitol gum.
Some brands do use xylitol — always check the label before giving peanut butter to your dog. Look for 'sugar alcohol,' 'xylitol,' or 'birch sugar' in the ingredients.
Within 30 minutes. Xylitol is absorbed almost immediately. This is one of the fastest-acting pet toxins — call Poison Control the moment you suspect ingestion.
Sudden weakness, vomiting, trembling, and loss of coordination are early signs. These can progress to seizures and liver failure rapidly.
Yes, with rapid treatment. Dogs treated within the first hour have excellent outcomes. Delayed treatment significantly worsens the prognosis.