6 month old Wosie just discovered this past week that barking is a lot of fun! After trying a firm "no barking" with a finger wag, we resorted to the penny can trick, and presto! No barking! It only took about 3 shakes of the can. I am truly amazed how quickly she learns. Now we just have to say no barking and she stops. I sure do love this little pup!
Good luck!