Many sugar free gums use the artificial sweetener xylitol. The most popular brand that uses this sweetener is Trident.
Many people are not aware that this particular sweetener can be extremely toxic to dogs.
The exact amount of gum that can be toxic for dogs can vary depending on the brand of gum, dog’s weight, age/health of the dog, and other factors.
If you suspect your pet has eaten any gum containing xylitol you need to contact your vet immediately.
Many vets will probably have you induce vomiting immediately (hydrogen peroxide can be used for this purpose) and then bring the pet in for further examination.
Xylitol can affect both liver and kidney functions so it is very important to take action if you suspect your pet has ingested this sweetener.