Xylitol Toxicity Calculator for Dogs
Calculate the xylitol dose from gum, peanut butter or baked goods and see whether it reaches the hypoglycaemia or liver failure threshold.
Count the empty wrappers, or the pieces missing from the packet.
Some brands use xylitol as the only sweetener. Assume this if unsure.
Hypoglycaemia likely
0.200 g xylitol per kg
Blood sugar can crash within 10 to 60 minutes: vomiting, weakness, stumbling, tremors, then seizures or collapse.
Emergency. Go to a vet now. Do not wait for signs. Blood glucose needs monitoring and often intravenous dextrose.
- Total xylitol eaten
- 2.00 g
- Hypoglycaemia threshold (0.1 g/kg)
- 1 pieces
- Liver injury threshold (0.5 g/kg)
- 5 pieces
Xylitol content is almost never printed on packaging and varies by a factor of five between brands of the same product. If you do not know which gum it was, assume the high-xylitol figure and call a vet.
How this is calculated
Xylitol dose is calculated per kilogram of body weight, as with any toxin. The difficulty is the amount in the product, which is rarely stated and varies enormously.
xylitol (g) = units eaten × grams per unit
dose (g/kg) = xylitol (g) ÷ body weight in kg Thresholds
| Dose | Effect | What happens |
|---|---|---|
| under 0.1 g/kg | Below reported thresholds | Poisoning is not expected at this dose, though stomach upset is possible. |
| 0.1+ g/kg | Hypoglycaemia likely | Blood sugar can crash within 10 to 60 minutes: vomiting, weakness, stumbling, tremors, then seizures or collapse. |
| 0.5+ g/kg | Risk of liver failure | Hypoglycaemia plus acute hepatic necrosis, which may not become apparent for 12 to 72 hours. Clotting problems can follow. |
Typical xylitol content
| Product | Xylitol per unit | Notes |
|---|---|---|
| Chewing gum, low xylitol | 0.22 g per piece | Many mainstream brands. Content is rarely stated on the pack. |
| Chewing gum, high xylitol | 1 g per piece | Some brands use xylitol as the only sweetener. Assume this if unsure. |
| Sugar-free mint | 0.3 g per mint | Smaller than gum but often eaten by the handful. |
| Sugar-free peanut butter | 1.4 g per tablespoon | A genuine danger because it is deliberately fed to dogs. Always check the label. |
| Sugar-free baked good | 3 g per portion | Muffins, cookies and cakes baked with granulated xylitol. |
| Granulated xylitol, teaspoon | 4 g per teaspoon | Baking sweetener sold in bags. The most concentrated household form. |
| Human toothpaste | 0.1 g per gram used | Low content, but never use human toothpaste on a dog. |
These are estimates. Gum in particular ranges from about 0.2 g to 1 g of xylitol per piece between brands, a fivefold difference, and content is almost never declared. If you do not know the brand, assume the higher figure.
Sources
Why peanut butter is the dangerous one
Nobody deliberately feeds their dog chewing gum. Peanut butter is different: it goes in Kongs, it hides tablets, it is used as a training reward. A sugar-free jar bought for someone's diet, used without checking, delivers a large dose to a trusting dog.
Check the label of every jar, every time you buy. Manufacturers change formulations, and "no added sugar" on the front is exactly the wording that should send you to the ingredients list.
Two separate problems
Hypoglycaemia comes first and fast, within an hour. Liver injury is a second, independent risk at higher doses, and it can appear a day or more later in a dog whose blood sugar never dropped. A dog that seemed fine after the first evening still needs its liver values checked if the dose was above 0.5 g/kg.
Common questions
How much xylitol is toxic to dogs?
Blood sugar crashes from about 0.1 g per kg of body weight, and liver damage becomes a risk above roughly 0.5 g/kg. For a 10 kg dog that is 1 g and 5 g respectively, which can be as little as one or two pieces of high-xylitol gum.
My dog ate sugar-free gum. What do I do?
Call a vet or a poison control line immediately, and do not wait for symptoms. Blood sugar can fall within 10 to 60 minutes. Take the packet with you, because the brand determines the dose and the content is almost never printed.
Why is xylitol so dangerous to dogs but not people?
In dogs, xylitol triggers a rapid and large release of insulin from the pancreas. Humans have no such response. The insulin surge drives blood glucose down fast, causing weakness, collapse and seizures.
Which foods contain xylitol?
Sugar-free gum and mints most often, plus some peanut butters, sugar-free baked goods, protein bars, chewable vitamins, nasal sprays, mouthwash and human toothpaste. It is also sold as a granulated baking sweetener, sometimes labelled birch sugar.
How do I know if my peanut butter has xylitol?
Read the ingredients every time you buy, not just once. Manufacturers reformulate. It may appear as xylitol, birch sugar or E967. If a peanut butter is labelled sugar-free or low sugar, assume it needs checking.
What are the symptoms of xylitol poisoning?
Vomiting first, then weakness, stumbling, tremors, collapse and seizures as blood sugar drops, typically within an hour. Liver failure is the second phase and may not appear for 12 to 72 hours, sometimes in dogs whose blood sugar never dropped at all.
Can a dog recover from xylitol poisoning?
Yes, with prompt treatment. Hypoglycaemia is managed with intravenous dextrose and monitoring. Liver injury is more serious and needs several days of hospitalization and repeated blood tests, but many dogs recover fully when treated early.