Interesting you posted this, as I was just last night researching foods
not to give to dogs. Wanted to make sure I never give Charlie anything bad for him.
Most articles I read said
Do Not give corn on the cob. Corn is obviously fine, but there have apparently been many cases where the dog ingested pieces of the cob. The cob can cause intestinal blockage, making other foods "back up", and require surgical removal.
Link to one of the articles I read on toxic or problematic foods:
Carol's Blog: The Bad Foods for Dogs List