What's a three-follower? What are the bad black sheep of the zodiac?

In the zodiac arrangement, there are just two gaps between the tiger and the dragon, and there are also two gaps between the dragon and the horse. Three followers, horse, sheep and chicken. So it's the zodiac dragon.

The zodiac dragon is generous and optimistic. They are adaptable, quick-thinking, busy and changeable, lively and talkative, intelligent and versatile, and have strong self-esteem.