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1- How long has it been since he ate the chocolate?
2- Do you have hydrogen peroxide 3%?
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I am sorry you are having this problem with your dog. In response to your question, 8oz of dark chocolate could be life-threatening to a 38 lbs dog. This is what you can do:
1- Move quickly and try to induce vomiting. To make him vomit give him 1 tablespoon of hydrogen peroxide orally.2- Allow him to walk for a minute and move his belly to mix stomach content with peroxide. If he does not vomit within 5-10 minutes, repeat it again. Can give a total of 3 times 5-10 minutes apart.3- If he does not vomit after the 3rd dose or you do not see most of the chocolate in the vomit I would have him checked by the nearest ER veterinarian, they can make him vomit with apomorphine and start supportive care.