Xylitol Toxicity in Dogs

Xylitol toxicity occurs when a dog ingests xylitol, a sugar substitute commonly found in sugar-free products, and experiences a rapid drop in blood glucose or, in some cases, liver injury. Xylitol triggers a strong insulin release in dogs that does not occur in humans, and this can lead to dangerously low blood sugar within minutes to hours. The liver effects, when they occur, may develop over a longer timeframe and follow a different pattern. Owners often arrive here after discovering their dog has eaten something containing xylitol—chewing gum, certain peanut butters, baked goods, some medications or supplements—or after noticing signs such as weakness, wobbly movement, tremors, or collapse. The dose ingested, the product involved, and how quickly signs appear all influence what happens next. Some dogs show no signs at all; others develop profound low blood sugar or progress to liver dysfunction. This page explores what xylitol toxicity can look like when it occurs, the mechanisms behind the blood sugar and liver effects, how the condition is investigated, and the approaches used to support affected dogs. It does not tell you what is happening in your own dog, but it may help you understand the shape of the condition and the conversations that may follow.