Excessive consumption of chocolate by a dog can cause diarrhea, panting, excessive urination, excessive thrust, abnormal heart rhythm, seizures, vomiting, muscle twitching, hyperactive behavior, digestive problems, change in hear beat, and even death.
You should immediately contact your vet doctor.
If your dog has consumed chocolate, you can look for the ways to make your dog vomit. Vomiting will help to remove the chocolate which has been ingested by your dog.
Offer your dog as much water as possible
See this link for further information https://www.petsworld.in/blog/important-...olate.html