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Chocolate contains theobromine and caffeine, both of which are toxic to dogs. Dark chocolate and baking chocolate have the highest concentrations and are most dangerous. Symptoms include vomiting, diarrhea, rapid breathing, increased heart rate, seizures, and in severe cases, death. Even small amounts of dark chocolate can be harmful. White chocolate has very little theobromine but is still not recommended due to high fat and sugar content. Contact your vet immediately if your dog eats chocolate.