My dog ate xylitol: how much is toxic, and what to do
Xylitol is a sugar substitute that's harmless to people — and one of the most dangerous things a dog can eat. It hides in "sugar-free" and "healthy" products, especially chewing gum, and it does two things to a dog: a sudden, steep blood-sugar crash (often within 30 minutes) and, at higher doses, liver failure. There's no antidote, so speed matters more here than with almost any other poisoning. Here's how to tell how bad it is and exactly what to do.
The 60-second version:
1. Identify the product and brand (gum? which one? peanut butter? candy?), roughly how much, and your dog's weight. Save the packaging.
2. Gum is the big one. Xylitol per piece varies enormously by brand (from about 0.2 g to over 1 g), so even a few pieces can be dangerous for a small dog.
3. Run the calculator below, then call your vet or a poison line — even if your dog seems fine.
4. Do not wait for symptoms. A blood-sugar crash can begin in 10–30 minutes; with some gums it can be delayed up to 12 hours, so a "fine" dog isn't proof of safety.
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How much xylitol is toxic to a dog?
Dogs (unlike people) absorb xylitol quickly and their bodies mistake it for real sugar, dumping a surge of insulin that crashes blood glucose. The dose is measured per kilogram of body weight:
| Dose of xylitol | What happens | Risk |
|---|---|---|
| Under ~0.1 g/kg | Often below the threshold for signs — but still call to be sure. | Lower |
| ~0.1 g/kg and up | Dangerous drop in blood sugar (hypoglycemia) — weakness, wobbliness, collapse, seizures. | High |
| ~0.5 g/kg and up | Risk of liver injury or failure, on top of the blood-sugar crash. | Severe |
The tricky part is translating "a few pieces of gum" into grams. A single piece can hold anywhere from about 0.2 g to over 1 g of xylitol depending on the brand, and packages rarely state it. For a small dog, that means even one or two pieces of a high-xylitol gum can reach a dangerous dose. The calculator does the conversion for you:
Dog xylitol toxicity calculator
Enter your dog's weight and what they ate for an instant risk level:
Prefer the full-page version? Open the Dog Xylitol Toxicity Calculator →
Where xylitol hides
This is what makes xylitol so dangerous: it's in far more than gum, and often in things marketed as "healthy." Check labels — it may also be listed as "birch sugar," "wood sugar," or E967. Common sources:
- Sugar-free gum and mints — by far the most common poisoning, and the highest-dose per piece
- Some peanut and nut butters — dangerous because people use PB to hide pills; always read the label first
- Sugar-free candy, breath strips, and mints
- "Keto," "diabetic-friendly," and low-carb baked goods and desserts
- Chewable vitamins, supplements, and some melatonin/gummies
- Dental products — toothpaste, mouthwash (including "pet" toothpastes; keep the tube away)
- Some liquid and chewable medications, and a few nasal sprays
Symptoms of xylitol poisoning — and the timeline
Signs of the blood-sugar crash usually appear within 10 to 60 minutes (sometimes delayed up to ~12 hours with certain gums). Liver injury, when it occurs, shows up later — 24 to 72 hours after. Watch for:
- Vomiting (often first)
- Weakness, lethargy, unsteadiness or a "drunk" walk
- Tremors, collapse, and seizures (from low blood sugar)
- Later signs of liver damage: yellowing of the gums/eyes, bruising, black tarry stool
Because the crash is fast and can be delayed, act on what was eaten — never wait to see if symptoms appear.
What to do if your dog ate xylitol
- Note the details: the product and brand (it determines the xylitol amount), roughly how much, and when. Keep the packaging.
- Gauge the dose: run the calculator. Small dog, high-xylitol gum, or any symptoms all mean act now.
- Don't induce vomiting on your own — especially if your dog is already weak, wobbly, or seizing, since a low-blood-sugar dog can choke. Let the vet decide.
- Call immediately: your vet, or a 24/7 line — ASPCA Animal Poison Control (888) 426-4435 or Pet Poison Helpline (855) 764-7661. Speed matters more with xylitol than almost anything else.
- Go to the ER for any weakness, collapse, or seizures, or if the calculator flags a toxic dose. Find the nearest open emergency vet →
What the vet will do
If it was very recent and your dog is still bright, the vet may induce vomiting to bring the xylitol back up. Because there's no antidote, the rest is close monitoring and support: frequent blood-sugar checks and IV dextrose to hold glucose steady through the crash, plus liver-value monitoring and protectant medications over the next one to three days if a liver-toxic dose was eaten. Dogs treated early for the blood-sugar crash usually do very well; the outlook is more guarded if liver failure develops — which is exactly why getting in fast changes everything.
What about cats?
Xylitol poisoning is essentially a dog problem — cats don't appear to have the same dramatic insulin response, and cases are rarely reported. Still, cats are far less likely to eat sweet things in the first place, so there's little reason to test it: keep gum and sugar-free products away from all pets, and call if you're ever unsure. For the bigger feline dangers, see our complete list of foods toxic to dogs and cats.
Frequently asked questions
How much xylitol is dangerous for a dog?
Roughly 0.1 grams of xylitol per kilogram of body weight can trigger a dangerous blood-sugar drop, and about 0.5 g/kg can risk liver damage. Because a single piece of gum can contain 0.2 to over 1 gram, even a few pieces can be toxic to a small dog — use the calculator above to estimate the dose.
My dog ate one piece of sugar-free gum — is that bad?
It can be, especially for a small dog or a high-xylitol brand where one piece holds close to a gram. Don't wait and watch — identify the brand, run the calculator, and call your vet or a poison line to be safe.
How fast does xylitol affect dogs?
Very fast — the blood-sugar crash often begins within 10 to 60 minutes, though some gums delay it up to about 12 hours. Liver injury, when it happens, appears 24 to 72 hours later. This speed is why xylitol is treated as an immediate emergency.
Can a dog survive eating xylitol?
Yes — most dogs recover well when the blood-sugar crash is caught and treated early with IV dextrose and monitoring. The prognosis is more guarded if a liver-toxic dose was eaten and liver failure sets in, which is why acting immediately matters so much.
Is xylitol in peanut butter?
Some brands of "no-sugar-added" or "sugar-free" peanut butter do contain xylitol. Because people often use peanut butter to give pills, always check the ingredient label before giving any peanut butter to a dog.
Is xylitol toxic to cats?
Xylitol poisoning is documented almost entirely in dogs; cats don't seem to have the same insulin response and cases are rare. It's still wise to keep xylitol products away from cats and to call a vet if your cat eats any.
Sources: ASPCA Animal Poison Control Center; Merck Veterinary Manual (xylitol toxicosis); Pet Poison Helpline. This guide is general information, not a substitute for veterinary advice — when in doubt, call a professional.