I will say Dog, because all the others were present in one form or another at the Battle of Five Armies.
A bear was present, in the form of Beorn. Bats were there too, swarming above the Goblin army. And of course Bilbo's famous cry heralded the arrival of the Eagles.
But, as far as I know, there was no Dog present at the battle.
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Do you mind? I'm busy doing the fishstick. It's a very delicate state of mind!
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