Most people know chocolate is bad for dogs, but the list of risky foods is longer than that.

• Grapes and raisins: Can cause sudden kidney failure, even in small amounts.
• Onions and garlic: Damage red blood cells over time and can lead to anemia.
• Xylitol: A sugar substitute in gum and some peanut butters that's toxic even in tiny doses.
• Cooked bones: Can splinter and cause internal injuries, unlike raw bones.
• Avocado: Contains persin, which is mild in dogs but still worth avoiding.