"I wouldn't risk it," Sirius said, which said a lot in and of itself. It was one thing to take risks yourself and another to just allow total strangers to do it without a good reason.

Unless it was really funny. Getting partially transformed as a dog and stuck that way for the rest of your life? Not so funny.

"I'd be more surprised if that form has DNA. It's advanced magic. There are plenty of ways for it to end very badly."