The Hail Dragon is a Cold/Lightning hybrid dragon in the game DragonVale.
Wizards have been noticing, and repairing, dents to their decorations for some time. The cause... hail dragons. The damage was unintentional. Hail dragons simply wag their tails enthusiastically when they see cool decorations. Now that they live in cold and lightning habitats, rest assured your decorations are safe.
The Hail Dragon can be bred by using any two dragons, in either order, containing the Cold and Lightning elements.