Is xylitol toxic to dogs?
Yes, and it is an emergency. Xylitol, a sugar substitute in sugar-free gum, sweets, some peanut butters and many medicines, makes a dog's body release a surge of insulin. Blood sugar can fall dangerously within about 30 minutes, and larger amounts can cause liver failure a day or two later. Small amounts matter. Go to a vet now and take the packet with you.
General information, not veterinary advice. If your pet may have eaten this, contact a vet now; do not wait for signs.
What to do right now
- Go to the nearest open vet or emergency clinic now
- Take the packet or wrapper so the vet can see the xylitol content
- Call ahead so the clinic is ready to check blood sugar
- Do not make your dog sick or give food or anything by mouth unless a vet tells you to
Go to an emergency clinic now if
- Your dog ate anything containing xylitol, even if it seems well
- Your dog is weak, wobbly or unusually quiet
- Your dog is vomiting after eating sugar-free gum, sweets or medicine
- Your dog is trembling, has a seizure or collapses
- Your dog's gums, eyes or skin look yellow in the days after
Who to call
Your own vet first. If they are closed, the nearest emergency or out-of-hours clinic.
In the United States
Both answer 24 hours a day and may charge a consultation fee.
Signs to watch for
| Sign | Usually starts |
|---|---|
| Vomiting | From 30 minutes |
| Weakness, wobbliness, lethargy | 30 minutes to 2 hours |
| Trembling, seizures, collapse | 30 minutes to 2 hours |
| Delayed low blood sugar with some gums | Up to 12-18 hours |
| Liver damage: lethargy, vomiting, yellow gums | 24-48 hours |
| Bleeding or bruising from liver failure | 24-48 hours or later |
Why is xylitol toxic to dogs?
Xylitol is a sugar alcohol used as a low-calorie sweetener. In people it barely affects insulin, but in dogs it triggers a rapid, dose-dependent release of insulin from the pancreas, which drives blood sugar down fast. Low blood sugar (hypoglycaemia) starves the brain of fuel, which is why weakness, wobbling and seizures can follow.
At higher doses xylitol also damages the liver. The reason is not fully understood, and some dogs develop liver injury without ever showing low blood sugar first.
How much xylitol is dangerous for a dog?
The Merck Veterinary Manual links doses above about 100 mg per kg of body weight to low blood sugar, and doses above about 500 mg per kg to severe liver injury. For a 10 kg dog, that is about 1 gram of xylitol for low blood sugar and 5 grams for liver damage.
The difficulty is that labels rarely say how much xylitol a product contains, and the amount varies widely between brands of gum, mints and sweets. That is why Pativo treats any xylitol as an emergency rather than asking you to calculate.
Xylitol turns up in more places than gum:
- sugar-free gum, mints and sweets
- some peanut and nut butters, puddings and baked goods
- chewable and gummy vitamins and supplements
- toothpaste, mouthwash and some cough syrups
- some quick-dissolve medicines and liquid medicines
What will the vet do?
The vet will check blood sugar straight away and keep checking it. If your dog has no signs and ate the xylitol recently, the vet may make your dog vomit; Merck advises this is done under veterinary supervision, because blood sugar can drop suddenly. Activated charcoal is not used, because it does not bind xylitol well.
Dogs that ate a significant amount are usually admitted. Merck recommends blood sugar checks every one to two hours for at least 12 hours, sugar given into a vein if it falls, and liver blood tests every day for at least 72 hours. Mild cases may go home after a day; dogs with liver injury need several days.
The outlook is good when low blood sugar is caught and corrected quickly, and when treatment starts before signs. Liver failure is far more serious: in one study cited by Merck, 62.5% of dogs with signs of liver injury died or were put to sleep despite treatment. This is the strongest reason to go to the vet before anything shows.
How do I stop it happening again?
- Check ingredient lists for xylitol or birch sugar before buying gum, peanut butter or sweets for a house with a dog.
- Keep handbags, coats and backpacks off the floor; gum in pockets is a common source.
- Store vitamins, toothpaste and medicines in a closed cupboard.
- Never use human toothpaste on your dog.
- Use Pativo's photo poison check on a label you are unsure about. It will not say a product is safe; if xylitol is not on its list it says it cannot confirm the product is harmless.
Sweets often contain chocolate too. For other signs that need a clinic immediately, see emergency signs.
Questions owners ask
How do I know if a product contains xylitol?
Read the ingredients list. It may also be called birch sugar or birch wood sugar. If you cannot tell, take the packet to the vet and treat it as if it does.
Is xylitol dangerous to cats?
Xylitol poisoning is documented mainly in dogs, and the insulin surge described here is a dog problem. Still keep xylitol products away from all pets and ask your vet if another animal eats one.
My dog ate one piece of sugar-free gum. Is that enough to matter?
It can be, especially for a small dog, because xylitol content varies widely between brands. Go to a vet now with the packet rather than trying to work it out at home.
Sources
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