Wrigley, fabriquant de chewing gums (en France sous la marque Freedent), précise sur son site web corporate US :

Is it OK for my dog to chew/eat sugarfree gum?

Some of our chewing gums contain xylitol, which is a safe, even
beneficial, additive which has been used in food, confectionery and
other products - like toothpaste - as a sweetener and flavor enhancer
for over 30 years and has been widely approved by regulatory
authorities all over the world.

Although chewing gum products are
not intended for use by dogs, cats or other pets, the American
Veterinary Medical Association (AVMA) has reported that xylitol may be
toxic for dogs.

In fact, in addition to food
products containing xylitol, the AVMA recommends that many foods that
are perfectly safe for humans be kept away from pets because of
potential harm - including coffee grounds, grapes/raisins, chocolate,
onions, yeast, dough, tea, macadamia nuts, alcohol, fatty foods, salt,
avocadoes and garlic. For more information, please go to avma.org.

On voit où la menace de procès peut emmener une société, aux USA.