The most dangerous common sweetener for dogs: a tiny amount triggers massive insulin release → hypoglycemia within 30 minutes, and higher doses destroy the liver. Hides in sugar-free gum, candy, peanut butter, baked goods, toothpaste.
The canine insulin response is not well documented in cats, but given the stakes: treat as toxic and keep away.
In dogs, xylitol reads as sugar to the pancreas — blood sugar crashes catastrophically.
Vomiting, weakness, staggering, seizures within 30–60 min; liver failure can follow days later.
EMERGENCY. Do not wait for symptoms — vet immediately, even for one piece of gum.
ASPCA Animal Poison Control: (888) 426-4435 · Pet Poison Helpline: (855) 764-7661 — 24/7, a fee may apply. Your own vet first when reachable.