Onions, garlic, leeks, and chives pose serious risks to pets due to their toxic compounds. These ingredients can cause gastrointestinal irritation and, more dangerously, damage red blood cells, leading to anemia. Even small amounts, whether raw, cooked, or powdered, can be harmful. Symptoms may include vomiting, weakness, and lethargy, which could escalate to more severe conditions requiring veterinary intervention. It's crucial to keep these foods out of reach to ensure your pet's health and well-being during meals and food preparations.