He's very stubborn and vocal. He never barks but he makes the howls and groans and such like you describe.
He loves poop... He used to constantly get kitty poo out of the litterbox before we got one of those top entrance litterboxes to prevent that. And he and my chihuahua both love eating the rat poo from around the DCN that the rats are in.

As for the new DCN, several pieces were broken so I contacted Midwest about it. So now I have to wait for the parts to come.