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Both raw and cooked onion can be toxic to dogs if consumed in high enough volume. Do you know how large the piece of onion was?
Very unlikely that such a small amount would cause him major problems. If it's been less than 2 hours and you want to be certain that he does not digest this, you can induce vomiting. Personally, I would not be concerned about such a small amount.Directions to induce vomiting: http://www.sunrisepetclinicaz.com/vomiting.html
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