Almost all dog owners know that dogs can't have chocolate. When we became dog owners, we looked up various lists of what dogs cannot eat. One thing that surprised us was Xylitol. What the heck is that? It is an artificial sweetener often used in chewing gum, and it's very toxic to dogs. So if you are a gum chewer, be careful with where you store your gum. Make sure your dogs can't get to it!
For your reference, click here for ASPCA's list of foods that are dangerous to dogs.