Some foods can be very dangerous for pets and should be avoided to ensure their safety and health. A few examples:

• Chocolate and caffeine. Chocolate contains theobromine and caffeine, stimulants that dogs and cats cannot metabolize effectively. Ingestion can lead to heart problems, seizures, and even death.
• Grapes and raisins. Even in small amounts, they can cause acute kidney failure in dogs. The exact mechanism is unknown, but the effect is potentially lethal.
• Onions and garlic. They contain thiosulfates, which can cause hemolytic anemia in dogs and cats, damaging red blood cells and making them more fragile.
• Xylitol. This artificial sweetener, common in sugar-free gum and candies, can cause a rapid release of insulin in dogs, leading to hypoglycemia and potentially liver failure.
• Chicken and other animal bones. Can splinter and obstruct or perforate the gastrointestinal tract. Moreover, cooked bones are particularly dangerous because they are more brittle.
• Alcohol. Even in small amounts, alcohol is toxic to pets. It can cause vomiting, diarrhea, breathing difficulties, coma, and even death.
• Avocado. Contains persin, a substance that can cause vomiting and diarrhea in dogs and cats. It is particularly dangerous for birds, rabbits, and some large pets.
• Dairy products. Many pets are lactose intolerant and can suffer from gastrointestinal upset after consuming dairy products.
• Macadamia nuts. Can cause weakness, depression, vomiting, tremors, and hyperthermia in dogs.
• Yeast dough. The dough can expand in the animal's stomach, causing pain and potentially leading to gastric torsion.