Animagus was never something Draco had considered doing, he had heard the horror stories of half transfigured humans stuck eternally between worlds. He valued self preservation too much to risk botching the process and destroying his body all for what? To become an animal? What if his form took the shape of a field mouse or worse.. A ferret. He imagined the way Granger's eyes would light up in mirth when he transfigured into the tiny white ferret from forth year all over again.