There is no guarantee that 5 Gum is safe for dogs just because it does not contain Xylitol.
Not only 5 Gum but chewing gum generally comes with certain risks and you should never give it to your dog.
Due to the fact that dogs can not chew on things for long periods of time like humans chewing gum presents a serious choking hazard to them.
In addition to that chewing gum contains a lot of other artificial sweeteners sugars and chemicals that are bad for your dogs health in the long run.