Yes, certain foods can be harmful or even toxic to pets. Examples include chocolate, grapes, raisins, onions, garlic, alcohol, caffeine, and xylitol (an artificial sweetener). These foods can cause various health issues in pets, ranging from gastrointestinal upset to organ failure and even death. It's crucial for pet owners to be aware of these dangers and avoid feeding their pets any potentially harmful foods. Consulting with a veterinarian can provide guidance on safe and appropriate dietary choices for pets to ensure their health and well-being.