Chocolate is a favorite treat for many people, but it can be dangerous for several animals. The main reason is theobromine, a natural compound found in cacao beans. While humans break down theobromine efficiently, many animals process it much more slowly, allowing it to build up to toxic levels.

The correct answer is C. Dog. Dogs are among the animals most frequently affected by chocolate poisoning because they are likely to eat food left within reach. Their bodies cannot eliminate theobromine quickly, making even moderate amounts of chocolate potentially harmful, especially dark chocolate and cocoa products.

Symptoms of chocolate poisoning in dogs may include vomiting, diarrhea, restlessness, a rapid heart rate, tremors, and seizures. In severe cases, the condition can become life-threatening without prompt veterinary care. Cats are also highly sensitive to theobromine, although they are less likely to eat chocolate because they cannot taste sweetness. Horses and some other animals may also become ill if they consume large enough amounts.

If a dog accidentally eats chocolate, it is important to act quickly. Identify the type of chocolate, estimate how much was eaten, and contact a veterinarian as soon as possible for guidance. Keeping chocolate stored securely and offering pets treats made specifically for them are simple steps that can help prevent accidental poisoning.