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Hi there. Thanks for the question. Im assuming you mean that your dog ate some part or all of a poppy seed muffin. Poppy seeds are not toxic to dogs...so here is really nothing to worry about as far as serious illness. If it was a large muffin, I suppose there is a small chance that it could cause some GI upset. Mild vomiting or diarrhea. I hope this helps. Best of luck.
Since you said, just a small amount of the muffin was eaten, you have nothing to worry about. Take care.