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Hi there. Thanks for the question. Let me see if I can help. I'm sorry to hear that Conner ate all your cookies! The good news is that he should be just fine. Being such a large dog, he would have to eat 15-16 ounces of semi sweet or milk chocolate to be toxic. I doubt there was that much in your cookies. If it was dark chocolate, then 6-8 ounces could be toxic. Now consuming a large number of cookies could cause some GI upset. If you know this happened in the last hour then you can induce vomiting by giving 3-4 tablespoons of hydrogen peroxide. He should vomit within 5 min. If it does not work, you can try a second time. Otherwise, just be aware he may vomit some later on his own over the course of a few hours or may have some diarrhea tonight and tomorrow. You can try to help with GI upset tomorrow by giving 20 mg Pepcid ac morning and night. Any GI issues should resolve within 24 hours. If he continues to have vomiting or diarrhea for more than 24 hours or can not keep water down, then he needs to see a vet. I hope this helps. Best wishes.