The Earth Dragon should fight from the ground!
I think it'd be cool if the Earth Dragon had it's own unique animations where I fought on foot instead of on the wing. I know it's a magical dragon, and I'm not saying it wouldn't be able to fly, but I think it would be a cool thing if, because it's a beast who's domain is the ground and stones and soil, it fought without taking off! It's 'engagement' knockback could be an earthquake instead of a gust of wind under it's wings.
Maybe the Water Dragon too, but especially the Earth Dragon.