Dragon

Appearance
Assuming that the Dragon will stay the same throughout development, the Dragon assumes a somewhat special design. It is a blocky form of dragon, assuming to have an aspect of fire due to it's color. It's good to mention that this mob is somewhat small compared to the other animals.

Speculation
As for attacks, the Dragon could possibly have both ranged and melee attacks. The ranged being as previously mentioned, a fireball. The melee attack might be a slash or bite, although there is no evidence to back that possibility up. Another is much more likely, the ability to tame and ride the dragon.