The danger with dogs eating chocolate is that there is a compound in it that increases their heart rate, sometimes dramatically enough that they can die. The darker the chocolate, the more dangerous it can be. A 100 lb dog has to eat a massive amount to be toxic.
If he/she has already passed the wrappers, there is virtually no danger. Symptoms would include hyperactivity, pacing, panting and frequent urination. I think your dog is fine!
You don't say how large these chocolates were. A 100 pound dog would have to eat a LOT of chocolate to be poisoned, though. A LOT.
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