Try this...
Comfort ZoneŽ Plug-In for Dogs | DrsFosterSmith.com
I ordered this and heard it works well so going to try.
Gracie, my (almost) 15 week old Yorkie doesn't really bark. She barks/whines when she gets up in the morning and wants out of her room, goes upstairs and then wants to come back down -- she is too little still to go down the stairs, or barks when she is playing with my other dog. She doesn't bark at people or noises.