Chocolate: Contains theobromine and caffeine, which are toxic to dogs and can cause vomiting, diarrhea, rapid breathing, increased heart rate, and seizures. Dark chocolate is especially dangerous.
Grapes and Raisins: Can cause acute kidney failure in dogs, leading to severe health issues and potentially death.
Xylitol: A sugar substitute found in many sugar-free products like gum, candy, and baked goods. It can cause a rapid release of insulin, leading to hypoglycemia (low blood sugar), liver failure, and even death.
Onions and Garlic: These contain compounds that can damage a dog's red blood cells, leading to anemia. This includes raw, cooked, or powdered forms.
Alcohol: Even small amounts can lead to ethanol poisoning in dogs, causing vomiting, diarrhea, central nervous system depression, difficulty breathing, tremors, and potentially death.
Macadamia Nuts: Can cause weakness, depression, vomiting, tremors, and hyperthermia in dogs. The exact cause of toxicity is unknown, but they can be fatal.
Avocado: Contains persin, which can cause vomiting and diarrhea in dogs. In large amounts, it can lead to more severe symptoms and be potentially fatal.