It's too late now but when a pup gets something that you think may upset the stomach it is a good idea to give it some of it's regular food along with it. That will help to make the effects of the cookie or whatever less because it mixes in with a larger amount of food that the body can handle. It is kind of like diluting the effect. The Oreo is made with dark chocolate so it could be quite upsetting. I spent most of Gracie's first year protecting her from herself. She gave me so many scares. She is 2 now and many of the bad habits have dropped off and she is not as dominate as she was although she still thinks she runs the place. I guess the terrier traits are part of what makes them so unique. Never a dull moment.
