So far this has been my understanding of people foods or ingredients to avoid for pets:

• Chocolate
• Grapes
• Raisins
• Onions
• Tomatoes
• Caffeinated beverages
• Garlic
• Nuts
• Salt
• Butter
• Cooked bones (chicken, turkey, pork, beef)
• Xylitol (sweetener in many sugar-free gum and candies)

If I have left anything off this list or if there is any inaccuracy, please let me know by posting a comment.  I would really appreciate it.  Thanks!