My dog ate xylitol — how bad is it?
Xylitol is one of the most dangerous common-household toxins for dogs. Hypoglycemia onset within 30–60 minutes. Don't wait — call a hotline as soon as you know.
Dose (mg/kg) = total_xylitol_mg / dog_weight_kg Hypoglycemia at 100 mg/kg · Liver injury at 500 mg/kg. A single piece of high-xylitol gum can cross hypoglycemia threshold in a small dog.
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Signs to watch for
Why xylitol is uniquely dangerous to dogs
In humans, xylitol has minimal effect on blood sugar — it's promoted as a tooth-friendly sweetener for diabetics. In dogs, it triggers an enormous insulin release (3–7× the effect of glucose), driving blood sugar to dangerously low levels within 30–60 minutes. This evolutionary quirk means an amount perfectly safe for a human child can be life-threatening for a small dog.
What treatment looks like
If within 30 minutes of ingestion: induced vomiting (apomorphine) may help, but absorption is fast — activated charcoal is sometimes given. IV dextrose infusion to maintain blood sugar for 12–24 hours. For higher doses: liver-protective drugs, IV fluids, monitoring of liver enzymes for 72 hours. Most dogs treated promptly recover fully.
Sources: ASPCA Animal Poison Control Center. Pet Poison Helpline. Dunayer EK. "Hypoglycemia following canine ingestion of xylitol-containing gum." Vet Hum Toxicol (2004). Merck Veterinary Manual.
Frequently asked questions
Why is xylitol dangerous to dogs?
Xylitol triggers a massive insulin release in dogs (but not in humans), causing rapid hypoglycemia (low blood sugar) within 30–60 minutes. At higher doses, it causes acute liver failure (3–5 days post-ingestion). This is one of the most dangerous common-household toxins for dogs — fatal at remarkably low doses.
Where is xylitol found?
Sugar-free gum (the most common exposure), sugar-free mints, "natural" peanut butter (some brands now include xylitol — read labels!), sugar-free baked goods, "tooth-friendly" candy, some toothpastes, some nasal sprays, some chewable vitamins. Always check ingredient lists for "xylitol", "birch sugar", or "wood sugar."
What's the toxic dose?
100 mg/kg = hypoglycemia threshold. 500 mg/kg = liver injury threshold. A single piece of high-xylitol gum (~1.5 g of xylitol) is dangerous for a 15 kg dog. The calculator accounts for product variability — different gum brands have wildly different xylitol content.
Symptoms?
Hypoglycemia signs within 30–60 minutes: vomiting, weakness, wobbly gait, lethargy, collapse, seizures. Liver injury signs 24–72 hours later: jaundice, persistent vomiting, dark urine. Both phases need vet intervention — do not wait at home.