Dogs cannot eat chocolate because it contains toxic substances called theobromine and caffeine, which dogs metabolize very slowly compared to humans. This slow metabolism causes the toxic compounds to build up in their system, leading to stimulation of their central nervous system and heart, which can result in symptoms like vomiting, diarrhea, increased heart rate, tremors, seizures, and even death in severe cases. The darker the chocolate, the higher the level of theobromine, making it more poisonous to dogs. Even small amounts can be harmful, especially in smaller dogs, and it is important to seek veterinary care immediately if a dog has ingested chocolate. White chocolate is much less toxic but still not recommended due to its fat and sugar content.
