About the Dog Xylitol Toxicity Calculator
This dog xylitol toxicity calculator estimates how much xylitol your dog swallowed relative to its body weight. Enter your dog’s weight and what was eaten — pieces of sugar-free gum or mints, grams of a product with a known xylitol percentage, or a known amount of xylitol — and it returns the dose in milligrams per kilogram, how that compares with the levels linked to dangerously low blood sugar and to liver failure, and how much xylitol would reach each level for your dog.
Xylitol is a sugar substitute found in sugar-free gum, breath mints, some peanut and nut butters, baked goods, toothpaste, mouthwash, vitamins and medicines. In dogs it triggers a large insulin release; the FDA notes blood sugar can crash within 10 to 60 minutes, and the Merck Veterinary Manual links doses above about 100 mg/kg with hypoglycemia and doses above about 500 mg/kg with severe liver injury or failure.
Xylitol content varies widely between brands and even between flavours of the same gum, and labels often list only “sugar alcohols”. If you are unsure, enter the total sugar alcohol figure as a worst case. This tool is for triage only: any xylitol ingestion is an emergency worth a phone call, so contact your veterinarian, an emergency clinic or an animal poison control line straight away rather than waiting for symptoms.
With the default inputs, the xylitol dose is 367 mg/kg. Change any value above to recalculate instantly.
How to use the dog xylitol toxicity calculator
- 1Enter your dog’s weight in pounds or kilograms.
- 2Choose whether it ate gum or mints, another product, or a known amount of xylitol.
- 3Enter the amount, using the label for xylitol content (or sugar alcohols as a worst case).
- 4Read the mg/kg dose and how it compares with the 100 and 500 mg/kg levels.
- 5Call your vet, an emergency clinic or animal poison control immediately.
Formula and method
The calculator first works out the grams of xylitol eaten: pieces × xylitol per piece, or product grams × xylitol percentage ÷ 100, or the amount you enter directly. It converts that to milligrams and divides by your dog’s weight in kilograms (pounds ÷ 2.2046) to get the dose in mg/kg.
The Merck Veterinary Manual reports that doses above approximately 100 mg/kg (45 mg/lb) have been associated with hypoglycemia in dogs, and that some dogs eating more than 500 mg/kg (227 mg/lb) develop severe liver insufficiency or failure. The threshold amounts are 100 or 500 × weight in kg ÷ 1000, in grams of xylitol. Because product contents vary and individual dogs differ, the result is an estimate for talking to your vet, not a diagnosis.
- xylitol eaten
- Grams of xylitol swallowed
- kg
- Dog’s body weight in kilograms
- 100 / 500
- Hypoglycemia and liver-injury thresholds in mg/kg (Merck)
Worked examples
30 lb dog eats 5 pieces of gum (1 g xylitol each)
Five pieces at 1 g each is 5 g, or 5,000 mg, of xylitol. The dog weighs 13.6 kg, so the dose is about 367 mg/kg — well above the 100 mg/kg hypoglycemia level, though below 500 mg/kg. Just 1.4 pieces of this gum would reach 100 mg/kg.
10 kg dog eats 60 g of a sugar-free baked good (10% xylitol)
60 g × 10% = 6 g of xylitol, or 600 mg/kg for a 10 kg dog. That is above the 500 mg/kg level Merck links with severe liver injury, so this dog needs emergency care and liver monitoring.
70 lb dog licks up 1 g of xylitol
A 70 lb dog weighs 31.8 kg, so 1 g (1,000 mg) of xylitol is about 31 mg/kg — below the 100 mg/kg hypoglycemia level. It would take about 3.2 g to reach it, but calling your vet is still wise because amounts are often underestimated.
Frequently asked questions
How much xylitol is toxic to dogs?+
The Merck Veterinary Manual says doses above about 100 mg per kg of body weight (45 mg/lb) have been associated with dangerously low blood sugar, and doses above about 500 mg/kg (227 mg/lb) can cause severe liver injury or failure. For a 10 kg dog, that is just 1 g and 5 g of xylitol.
What are the symptoms of xylitol poisoning in dogs?+
Vomiting followed by signs of low blood sugar: weakness, lethargy, staggering, collapse and seizures. The FDA says this can begin within 10 to 60 minutes, but signs may be delayed up to 12–24 hours. Signs of liver failure can take 24–48 hours or more to appear.
How much xylitol is in a piece of gum?+
It varies widely — between brands and even between flavours of the same brand — and some gums contain none. Check the label for xylitol or total sugar alcohols per serving and divide by the pieces per serving; if xylitol is the first ingredient, assume a high amount.
What should I do if my dog ate xylitol?+
Call your veterinarian, an emergency clinic or an animal poison control line immediately, even if your dog seems fine. Have the package handy. Do not induce vomiting at home unless told to, because a dog with low blood sugar can deteriorate quickly.
Which products contain xylitol?+
Common sources include sugar-free gum and breath mints, some peanut and nut butters, sugar-free baked goods and desserts, toothpaste, mouthwash, chewable vitamins, supplements and some medicines. It may be listed as xylitol, birch sugar or simply as a sugar alcohol.
This tool gives general estimates and is not medical advice. Talk to a doctor or qualified professional about your health, diet or training.