Chocolate IS toxic to dogs, your dog was obviously lucky and hadn't ingested enough to make him ill.
Look at the quantities of chocolate that will harm a dog in the link that George H posted. 1/16th of an ounce is a tiny amount, possibly the amount in a couple of squares of choc.
Do you want to play with your dogs life?
Buy him doggy chocs or other dog treats, there's no need to risk making him ill.
Splitz
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