This is Trenchy. Trenchy was Castiel's old trenchcoat. Trenchy was loyal and good and served his master well. And then Trenchy got left behind. Trenchy is not dead. Trenchy wants his master back. Trenchy wants to tear his master's new 'trenchcoat' from thread to thread.
It would be so easy to kidnap this kid.
(Photos from various sources including yukiteru’s tumblr and Jing Castle).