Dog Xylitol Toxicity Calculator
Dog got into sugar-free gum, sweets or xylitol peanut butter? Enter their weight and how much to see the dose, the risk level, and exactly what to do next.
Xylitol per piece varies up to ~8× by brand (≈0.1–1 g). This assumes a high ~1 g/piece to stay safe.
Enter your dog's weight and how much they had to see the risk.
- ASPCA Animal Poison Control: (888) 426-4435 · US (fee may apply)
- Pet Poison Helpline: (855) 764-7661 · US/Canada (fee may apply)
This is an estimate to help you decide whether to call, not a diagnosis. When the amount is uncertain or your pet is small, young or unwell, treat it as more serious and pick up the phone.
Estimate only — not veterinary advice. Every animal is different; for a medication dose, a possible poisoning, or any emergency, call your veterinarian or an animal poison control line right away.
How the xylitol dose is calculated
Xylitol is dangerous because a dog's body mistakes it for sugar and dumps a flood of insulin, which crashes blood glucose. Risk is driven by the dose— milligrams of xylitol per kilogram of body weight. This tool multiplies the amount you enter by a (deliberately high) estimate of the xylitol in that product, then divides by your dog's weight. Two thresholds matter: around 100 mg/kg for a blood-sugar crash, and around 500 mg/kg for the risk of liver injury.
Why gum is the sneaky one
The same single piece of gum can hold anywhere from about 0.1 to 1 gram of xylitol depending on the brand — an eightfold range that's almost never on the label. A small dog and one or two pieces of a high-xylitol gum can already reach the danger zone. Because of that, this calculator assumes the higher end, and you should too: when you don't know the brand, treat it as the strong one.
What to do right now
- Act fast — a blood-sugar crash can start within the hour.
- Don't induce vomiting unless a professional says to; a hypoglycemic dog can't protect their airway.
- Call your vet or a poison line (ASPCA 888-426-4435, Pet Poison Helpline 855-764-7661) with your dog's weight and the product.
- If advised and your dog is alert, a little honey or syrup on the gums can help on the way in — confirm first.
Frequently asked questions
- How much xylitol is toxic to a dog?
- Trouble starts low. A blood-sugar crash (hypoglycemia) can begin around 0.1 g (100 mg) of xylitol per kg of body weight, and liver injury becomes a risk around 0.5 g (500 mg) per kg. For a 10 kg (22 lb) dog that's only about 1 gram of xylitol — which can be a single piece of some sugar-free gums. The calculator turns the product and amount into a dose for you.
- Which products contain xylitol?
- Sugar-free gum and mints are the classic culprits, but it's also in some peanut and nut butters (always check the label before using one for pills or a food toy), sugar-free candy and baked goods, chewable vitamins and supplements, some children's medicines, toothpaste, and granulated 'natural' sweeteners. It may be listed as xylitol or 'birch sugar'.
- How fast does xylitol affect dogs?
- Fast. Xylitol triggers a large insulin release in dogs, so blood sugar can crash within 30–60 minutes — though gum can release it more slowly, over several hours. Liver injury, when it happens, develops over 12–72 hours. Because it moves quickly, don't wait and watch; call right away.
- What are the symptoms of xylitol poisoning?
- From the blood-sugar crash: weakness, wobbliness, trembling, vomiting, and in severe cases collapse or seizures. Liver damage can cause vomiting, yellow gums, black stool and easy bruising over the following days. Any of these after a possible xylitol snack is an emergency.
- Why is the amount only an estimate?
- Because manufacturers rarely print how much xylitol is in a piece of gum, and it varies up to eightfold between brands. This tool assumes a high amount per piece to keep you on the safe side. If you still have the packaging, bring it — and when in doubt, assume more rather than less.
Sources
These are the references behind this calculator. Where a source gives a range we take the midpoint and round toward caution, and where we go beyond what a source states — an extra safety margin, or a rule of thumb rather than a clinical threshold — the page says so in the text above.
- Xylitol — Pet Poison Helpline
- Xylitol toxicity in dogs — VCA Animal Hospitals
- Animal Poison Control Center — ASPCA