Aww, yay for the holidays! I'm sure you'll all have a splendid Christmas.
I've only had one bad experience with the presents under the tree, and that was with my old Black Lab. We wrapped up a thing of Dunkin Donuts coffee for my Grandpa because it was his favorite and oh man. We waited until Christmas eve to put the presents out because we figured she'd attack them, but she only went for the one. The coffee. LOL. So I wouldn't put any food under the tree.