No — dangerous
No — xylitol is one of the most dangerous things a dog can swallow. This sugar-free sweetener causes a sudden, life-threatening drop in blood sugar and can lead to liver failure. Even tiny amounts matter.
Xylitol (also labelled “birch sugar” or E967) is a sweetener in sugar-free gum, mints, sweets, some peanut butters, baked goods, toothpaste, vitamins and medicines. In humans it is harmless, but in dogs it triggers a massive, rapid release of insulin, crashing blood sugar within 15–60 minutes; larger doses cause acute liver failure. A few pieces of xylitol gum can poison a medium dog. This is a true emergency — speed of treatment is everything.
There is no safe amount. If you even suspect your dog ate something with xylitol, do not wait for symptoms — call your vet or a pet poison helpline immediately and bring the packaging. Time is the difference between a good and a bad outcome.
Keep all gum, mints and sugar-free products well out of reach. For a sweet dog treat, use plain blueberries or banana.
General information, not veterinary advice. If your pet has eaten something potentially harmful or shows symptoms, contact your vet or an emergency clinic immediately. Full disclaimer.