Chocolate may be a delicious treat for people, but it can be extremely harmful to some animals. The danger comes from theobromine, a natural compound found in cacao beans. Humans can process this substance efficiently, but many animals break it down much more slowly, allowing toxic levels to build up in their bodies.

The correct answer is C. Dog. Dogs are among the most common victims of chocolate poisoning because they often eat foods they find, and their bodies cannot eliminate theobromine quickly. Even small amounts of dark chocolate or cocoa products can cause symptoms such as vomiting, diarrhea, increased heart rate, shaking, seizures, and in serious cases, life-threatening complications.

Other animals can also be affected. Cats are highly sensitive to theobromine, but they usually avoid chocolate because they cannot taste sweetness. Horses may also experience harmful effects because chocolate compounds can interfere with their heart and digestive system. Even larger animals can become ill if they consume enough chocolate.

If a dog accidentally eats chocolate, it is important to act quickly. Determine what type of chocolate was eaten and how much was consumed, then contact a veterinarian for advice. Prevention remains the best protection—store chocolate where pets cannot reach it and provide treats designed specifically for animals. A little caution can help keep pets safe and healthy.