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Hi, this is Dr. Gabby. That is not enough chocolate or foil to cause concern. If he ate 10 or more then we may have a problem.
So You do not have to do anything.
If he has a sensitive stomach you may see some vomiting or diarrhea over the next 48 hours.
If that happens feed him a bland diet of plain cooked chicken and rice.
You can also give him 1/4 of a 10 mg Pepcid AC tablet, per each 15 pounds of dog, every 12 hours as needed. Pepcid AC is a human over the counter stomach acid reducer.
If he does not have any signs of an upset stomach then you do not need to do anything.
Does that help? Do you have any additional questions?