Xylitol Toxicity Calculator for Dogs
Xylitol is a sweetener found in many sugar-free products. It can cause a dangerous drop in a dog's blood sugar quickly. Enter the amount of xylitol and your dog's weight to see how the dose compares with published levels — then call your vet.
Why xylitol is dangerous for dogs
In dogs, xylitol causes the pancreas to release a large amount of insulin, which can make blood sugar drop sharply. According to the Merck Veterinary Manual, doses above about 100 mg/kg have been linked to hypoglycemia, and some dogs eating more than about 500 mg/kg develop severe liver failure.
Dose (mg/kg) = grams of xylitol × 1000 ÷ dog's weight in kg
Hypoglycemia: > ~100 mg/kg (45 mg/lb)
Liver injury: > ~500 mg/kg (227 mg/lb)
Where xylitol hides
Sugar-free gum and mints, some candies, baked goods, some peanut and nut butters, chewable vitamins, some liquid medicines and toothpastes. The U.S. FDA advises checking labels for xylitol (sometimes listed as "birch sugar") before sharing any food with a dog.
Signs to watch for
Vomiting, weakness, wobbling, collapse, tremors or seizures. Do not wait for signs — call a vet right away.
Frequently asked questions
How much xylitol is toxic to dogs?
Merck cites doses above about 100 mg/kg for low blood sugar and above about 500 mg/kg for possible liver failure. For a 10 kg (22 lb) dog that is just 1 gram and 5 grams of xylitol.
Is peanut butter safe for dogs?
Plain peanut butter without xylitol is generally fine in small amounts. Always check the label for xylitol or "birch sugar".
Is xylitol toxic to cats?
Reports in cats are limited, but it is safest to keep xylitol away from all pets.
Sources
- Merck Veterinary Manual — Xylitol toxicosis in dogs
- U.S. FDA — Paws off xylitol; it's dangerous for dogs
- ASPCA Animal Poison Control Center