Common barbecue foods dangerous for dogs include cooked bones, which can splinter and cause internal injury, and foods like grapes, raisins, and currants that can lead to kidney failure. Pitted fruits and avocado can cause obstruction and toxicity, respectively. Chocolate, alcohol, caffeine, and anything with xylitol are toxic, causing various issues from vomiting to more severe conditions like hypoglycemia and neurological problems. Garlic, onions, scallions, and chives contain compounds that can damage red blood cells, leading to anemia. Always ensure your dog’s snacks are safe and avoid these harmful items.