9cf63ef4_s__onions__etc____PragmaticMom__Reasons_to_avoid
[Items to avoid] Milk and other dairy products [Reasons to avoid] 
Some adult dogs and cats do not have sufficient amounts of the enzyme lactase, which breaks down the lactose in milk. This can result in diarrhea. Lactose-free milk products are available for pets.
Things Dogs Eat That Will Kill Them: Raisins, onions, etc. : PragmaticMom
Reasons to avoid