okay, so. dragons is a flying animal, right? but sometimes a dragon is a fish. bnuy is a land-based animal. easy. they can both live under the ground, but a dragon may live in a cave (big hole) whereas bunnys live in a burrow (small hole). case-by-case studies will reveal outliers (@dragongirlcloaca illegally small) but generally a dragon is Large and a buny is small. the same difference also extends to the tails: dragon tail = big slappy; bunny tail = noslappy!
additionally, a dragon is a very regal sort of animal, whereas top bunny scientists report that at best bunnies achieve a formal rating of "sopping wwet animal"