Sofa, one of our old english sheepdogs, is always licking stuff too, tables, the excercise manchine, rocks and the dinner table legs, and she loves to lick my wife and me. No matter what, she never seems to stop. She likes to take away things from the alpha male, but if you chase her to take it away, she turns her belly up to the sky. The same thing when it's time to go out potty... Sometimes I have to drag her outside...
She has a history of abuse before we adopted her a year ago, and she was very neglected. If an stranger or a tall man rises his hand on her, she gets submisive urination, but besides that, she's playful and likes to meet new people. We're doing our best to care for her, and we really don't mind that much licking, but it would be much nicer if we cold teach her to stop licking so much.
What could be causing all that licking?