TL;DR: Xylitol is a highly toxic sugar substitute for dogs that can cause life-threatening low blood sugar and liver failure; seek immediate emergency veterinary care if ingestion is suspected.
What is xylitol and why is it dangerous for dogs?
Xylitol is a natural sugar substitute frequently found in sugar-free gum, breath mints, toothpastes, and some peanut butters. While it is perfectly safe for human consumption, it is extremely dangerous for canines. In dogs, xylitol causes the pancreas to release a massive amount of insulin, leading to a rapid and life-threatening drop in blood sugar.
Is it a medical emergency if my dog eats gum with xylitol?
- Urgency Level: High. This is an immediate medical emergency.
- Ingesting even a small amount of xylitol can lead to hypoglycemia (low blood sugar), seizures, liver failure, or death.
- Do not wait for symptoms to appear before seeking help.
- If you suspect ingestion, contact an emergency veterinarian or an animal poison control hotline immediately.
Why should I take a photo of the product packaging for the veterinarian?
- A photo of the gum's packaging—specifically the ingredient list and product weight—is incredibly helpful for triage.
- Different brands contain varying concentrations of xylitol, and the photo allows the veterinary team to calculate the exact toxic dose.
- This information helps the clinic prepare the appropriate treatment plan before you even arrive at the door.
Clinical Context (Merck Veterinary Manual)
In dogs, xylitol stimulates a rapid, dose-dependent insulin release, potentially resulting in profound hypoglycemia. Dosages >75-100 mg/kg can cause hypoglycemia, with signs developing within 30 minutes or delayed up to 12-18 hours. Clinical signs of hypoglycemia include vomiting, weakness, ataxia, depression, hypokalemia, seizures, and coma. Ingestion of xylitol at dosages >500 mg/kg may lead to severe hepatic insufficiency or failure, with liver injury signs possibly appearing 24-48 hours post-ingestion, though liver enzyme increases may be detectable within 8-12 hours. If xylitol ingestion exceeds 75-100 mg/kg, hospitalization is recommended, with baseline blood glucose values measured, and for ingestion >500 mg/kg, baseline liver values should also be measured. Blood glucose should be monitored every 1-2 hours for at least 12 hours, and liver values every 24 hours for at least 72 hours. Activated charcoal is not recommended as it does not appreciably bind xylitol. Hypoglycemia should be managed with dextrose IV boluses and/or constant-rate infusions until the dog maintains normal blood glucose without supplementation, potentially for up to 24 hours or more. Dextrose should be administered even to normoglycemic dogs ingesting xylitol at >500 mg/kg, and hepatoprotectants like N-acetylcysteine, S-adenosylmethionine, and silymarin should be considered.
Chapter: Toxicology, Emergency, Internal Medicine
Source: The Merck Veterinary Manual, 11th Edition (Page 2969)