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It takes approximately 2 ounces of milk chocolate per kilogram of body weight to intoxicate a dog with the theobromine in chocolate which can cause agitation, vomiting, and tremors if ingested in sufficient amount. It takes 2/3 of an ounce of dark chocolate per kilogram of body. I suspect that an adult Lab didn't ingest nearly the amount to intoxicate himself and so will remain safe. As with ingesting anything unusual transient gastrointestinal distress in the form of inappetence, vomiting and/or diarrhea can arise, however.