Spooky is just a smaller version of Squire Tom. Mine do the mouth thing too...It's a nurturing thing that mama dogs do IIRC. The other evening they were rolling on the carpet, doing the mouthing thing. Tom jumped up, pulled Rascals tail, hid under the couch to look and see if she was following him....They bring such joy!
We keep catnip growing by the front door for Tom...He leaves it alone unless we crush some of it....Then he helps trim it back or rolls in it.