Yes, 200 grams of chocolate is potentially dangerous for dogs. Chocolate contains theobromine and caffeine, which can be toxic to them. The severity of the effects depends on the type of chocolate, with darker chocolates posing a higher risk. Ingesting this amount could lead to symptoms like vomiting, diarrhea, increased urination, rapid breathing, irregular heartbeat, seizures, and in severe cases, it can be fatal. As a pet owner, it’s crucial to keep chocolate and other harmful substances out of your dog’s reach. If you suspect your dog has consumed chocolate, contact your vet immediately for guidance.