Sounds like something my husband would do. My Dad left out a thing of Dean's French Onion one day and ran to the bathroom (got sick) and came out to find my Mom's Cairn standing on the sofa with her head in the french onion dip. My Mom callled me to tell me about it and I informed her that onions are poisonous to dogs and she paniced. Needless to say, my forgetful father doesn't leave stuff around anymore either.