Xylitol Poisoning in Dogs: The Sweetener That Can Kill
Dr. Michael Chen, DVM
Omelo Vet · Licensed Veterinarian
Xylitol is lurking in hundreds of everyday products - from gum to some peanut butters. For dogs it can be fatal within hours. Here's what every owner must know.
If you own a dog and haven't checked your peanut butter jar for xylitol recently, stop reading and check it now. Xylitol is an extraordinarily common ingredient in 'healthy' and sugar-free products that is simultaneously extraordinarily dangerous for dogs.
**What is xylitol?**
Xylitol is a naturally occurring sugar alcohol found in small amounts in fruits and vegetables. Commercially, it's produced from birch bark or corn cobs and used as a sweetener in products marketed to health-conscious consumers and diabetics. It has about the same sweetness as sucrose (table sugar) but with fewer calories, a low glycaemic index, and proven benefits for dental health in humans.
For dogs, it's a different story entirely.
**The mechanism of toxicity**
In humans and most animals, xylitol absorbed from the gastrointestinal tract doesn't significantly stimulate insulin secretion. In dogs, the pancreatic beta cells mistake xylitol for glucose and release a large, disproportionate amount of insulin - far more than would be produced by the equivalent amount of actual sugar.
This drives blood glucose to dangerously low levels (hypoglycaemia) within 30–60 minutes of ingestion. Meanwhile, in doses above approximately 0.5g/kg body weight, xylitol also causes acute hepatic necrosis - death of liver cells - through a mechanism that isn't fully understood but is distinct from the insulin-driven hypoglycaemia. Liver failure typically becomes apparent 24–72 hours after ingestion.
**How much is dangerous?**
Toxic threshold for hypoglycaemia: ~0.1g/kg body weight Risk of liver failure: >0.5g/kg body weight
The amount of xylitol per piece of gum varies enormously - from approximately 0.2g to over 1g per piece. A full pack of gum in a small dog (5kg) could easily exceed the liver failure threshold.
**Products that commonly contain xylitol** (always check labels - formulations change):
- Sugar-free chewing gum (almost universally contains xylitol)
- Some peanut butter brands (GoNuts On the Go, Nuts 'n More, P28, Krush Nutrition, No Cow Nut Butter Bars)
- Sugar-free candies and mints
- 'Low-sugar' baked goods and snack bars
- Oral care products (mouthwash, some toothpaste)
- Some dietary supplements and vitamins
- Some prescription liquid medications
**What to do immediately**
- Note what product was ingested, the xylitol content if listed, and how much your dog may have consumed
- Call your vet or ASPCA Poison Control (888-426-4435) immediately - before symptoms appear
- Your vet may advise inducing vomiting if ingestion was very recent and the dog is not yet symptomatic
- Expect your dog to be admitted for blood glucose monitoring and supportive care
**The prognosis**
Treated before liver failure develops: generally good. Treated after liver failure is established: guarded to poor, and intensive care is expensive. Speed of response is everything.
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