Bullingdozers are not seen in the book series, but are mentioned in the Dragon Key at the back of The Incomplete Book of Dragons.
Physical Appearance[]
Bullingdozers are classified as Tree Dragons that are very large, perhaps along the order of Darkbreathers, Battlegores, or Bee-Eaters (all of which received 1 'dragon-next-to-a-mountain' icon). They are noted as possessing multiple heads.
There is no imagery of the Bullingdozer, but we do get to see what this dragon's feces looks like.
Abilities[]
Bullingdozers can speak Dragonese, and interestingly, have hypnotic capabilities. They remained unaligned during the Dragon Rebellion.