Xylitol toxicity calculator
Xylitol is far more dangerous to dogs than chocolate, gram for gram — it can crash blood sugar within 30 minutes and injure the liver at higher doses. The math is dose per kilogram, and the trap is that xylitol content varies enormously between products that look identical.
If your dog ate anything with xylitol, make the call regardless of what this page says: ASPCA Poison Control (888) 426-4435 or Pet Poison Helpline (855) 764-7661. Two reasons the calculator can't replace the call: many products don't publish their xylitol content, and signs can be delayed 12+ hours with gum — a normal-looking dog proves nothing.
Not sure how many? Count what's missing from the pack and assume the dog got all of it. Per-piece figures are published estimates; brands change recipes without notice — which is itself a reason to call.
Thresholds follow published veterinary toxicology: hypoglycemia risk from roughly 0.1 g of xylitol per kg of body weight; liver injury risk from roughly 0.5 g/kg. This tool never outputs "safe" — see why below.
Why there's no green "safe" result
Two honest limits. First, labels hide the number: most gum brands list xylitol in the ingredients without saying how much, and the same brand's flavors can differ 30-fold — one stick of a low-xylitol gum is a different event from one cube of an all-xylitol brand. When the product is uncertain, this calculator assumes a typical-high value, and the only honest floor is "call poison control." Second, gum releases slowly: swallowed whole, pieces can drip xylitol for hours, so signs (and danger) can be delayed well past the point where everyone relaxes.
What xylitol actually does
A dog's pancreas mistakes xylitol for real sugar and dumps insulin — blood glucose can crash within 30–60 minutes (weakness, stumbling, trembling, collapse, seizures). At higher doses, xylitol injures the liver, sometimes with signs delayed a day or more. Both are treatable when treatment starts early — IV dextrose support for the sugar crash, monitoring and liver protectants for the rest — which is why the phone call beats watchful waiting every time. Cats and people aren't affected the same way; this is a dog-specific emergency.
Where xylitol hides
Sugar-free gum and mints are the classics, but check: "skinny" or diabetic peanut butters (a real trap — people use PB to give pills), sugar-free candy and chocolate (double-check ourchocolate calculator if it was sugar-free chocolate — you may need both), some human toothpastes, melatonin gummies, chewable vitamins and medications, and some baked goods. "Birch sugar" on a label is xylitol wearing a disguise.
If the math above says go — or you can't do the math because the label won't tell you —the nearest emergency vet is here. Call while driving.
About this guide. Written and maintained by the VetsOpenNow editorial team. We are not veterinarians, and this is general information rather than veterinary advice — it cannot account for your animal's history, species, breed, age or medication. Anything describing a symptom is written to help you decide whether to call a professional, never to replace one. When guidance here differs from what a vet tells you about your animal, follow the vet.
Last reviewed September 2026. Spot something wrong? Tell us — we correct errors quickly.