Is Xylitol Toxic to Dogs? Hidden Sources to Check

By Tailwisp Editorial TeamUpdated October 17, 20263 min read

Xylitol is a common sweetener that is harmless to humans and deadly for dogs. It has turned up in more and more household products, which has led to a steady rise in poisoning cases. Knowing where it hides could save your dog's life.

What is xylitol?

Xylitol is a sugar alcohol used as a sugar replacement because it is low in calories and does not cause tooth decay. It is also called birch sugar. It is found in many products labeled "sugar-free" or "no sugar added".

Why it is toxic to dogs

In people, xylitol is absorbed slowly and has little effect on insulin. In dogs, it is absorbed rapidly and triggers a surge of insulin from the pancreas. Blood sugar then plummets, causing hypoglycemia. At higher doses, xylitol can also cause severe liver damage and liver failure. Even a small amount of sugar-free gum can be dangerous for a small dog.

Approximate thresholds

Veterinary references suggest that doses of around 0.1 grams per kilogram of body weight can cause hypoglycemia, and doses above about 0.5 grams per kilogram may be linked with liver damage. These are rough guidelines, and products vary. Do not try to calculate whether it is safe. Call for advice.

Where xylitol hides

• Sugar-free gum, mints and candies
• Some peanut butters and nut butters. See peanut butter for dogs
• Baked goods and sugar-free desserts
• Toothpaste and mouthwash
• Chewable vitamins and supplements
• Gummy vitamins
• Some medications, including liquid and fast-melt formulas
• Sugar-free syrups, jams, yogurts and puddings
• Some sinus rinses, nasal sprays and skin products
• Protein bars and drink mixes

Always check labels, and recheck when products change recipe.

Signs of poisoning

• Vomiting
• Weakness and lethargy
• Wobbly walking or collapse
• Tremors
• Seizures
• Dark stool or yellowing of the gums, signs of liver damage that may appear later

Signs of low blood sugar often appear within thirty to sixty minutes, but extended-release products may take longer. Liver failure may develop over one to three days.

What to do

1. Act immediately. Do not wait for signs.
2. Call your vet, an emergency clinic or a pet poison helpline.
3. Have the product packaging, the estimated amount eaten and your dog's weight ready.
4. Do not induce vomiting at home unless instructed. If your dog is weak or having seizures, vomiting is dangerous.
5. Follow instructions. Your vet may check blood sugar, give dextrose, start fluids and monitor liver values.

See what to do if your dog is poisoned.

Treatment and outlook

With early treatment, many dogs recover. Treatment can include glucose supplementation, intravenous fluids, liver-protective medications and hospitalization for monitoring. Dogs that develop liver failure have a more guarded outlook.

Prevention

• Check every sugar-free product before it enters your home.
• Keep gum, mints and bags with these items out of reach, including in handbags.
• Ask guests to keep items out of dogs' reach.
• Use dog-specific toothpaste.
• Tell family members about the danger.

Xylitol and other sweeteners

Not every sugar substitute is toxic to dogs in the same way, but it is safest to keep all sugar-free products away. Some sweeteners can cause digestive upset, and sugar-free products can contain other dangerous ingredients such as chocolate or caffeine. Always read the ingredient list for any product your dog could reach, and keep a list of risky items in your home.

Medications and supplements

Some liquid medicines, chewable tablets and gummy supplements for people include xylitol. Do not give human medicines to dogs unless a vet tells you to, and check with a pharmacist if you are unsure. Store all medicines in closed cupboards, because dogs can chew through bottles and packaging.

Travel and handbags

Many cases involve dogs getting into handbags, backpacks and coat pockets that hold gum or mints. Hang bags out of reach, and ask visitors to do the same. A quick scan of the floor and low tables before letting your dog into a room can prevent a lot of heartache.

The takeaway

Xylitol is a serious poison for dogs. Check labels, store products safely and call for help at once if you suspect ingestion. See also chocolate toxicity.

This article is general educational information, not veterinary advice. Every dog is different. If your dog is unwell, or you are unsure about a symptom, diet change or medication, contact your veterinarian.