9cf63ef4_s__onions__etc____PragmaticMom__Reasons_to_avoid
[Items to avoid] Potato, rhubarb, and tomato leaves; potato and tomato stems [Reasons to avoid] 
Contain oxalates, which can affect the digestive, nervous, and urinary systems. This is more of a problem in livestock.
Things Dogs Eat That Will Kill Them: Raisins, onions, etc. : PragmaticMom
Reasons to avoid