That small of an amount this one time in a dog that looks as large as yours has probably not done any damage but in the future it would be best not to feed your dog 'anything' that is in the allium family in any amount. You can search the internet for which plants are considered alliums. Even many flowers are in that family. Long term damage of even small amounts can cause Heinz Body Anemia so it's best to simply steer clear of allium in any form.
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