The Dragontagace is a strange Dragon; if it bites a person, the person will contract Dragontagious and become a Dragontagace. You can tell a true Dragontagace from a transformed one, since transformed Dragontagaces have short, stubby tails and real ones have long tails. In the episode "Dragontagious", Lian Chu got bitten and became a Dragontagace. The only way to save a person from Dragontagious and make them become a human again is to stab them (In their dragon form) in the leg. Dragontagaces seem to be fond of wool.