OH, "The Joy of Barking"....mine discoved it around a year old, Opie really gets into barking, Sophie she does it when shes bored and wants Ops to entertain her.....Up untill then neithe of them knew the word NO, they do now, No bark. The most amazing thing is little Sophie (4 lbs), she's will howl once in awhile, surprises the heck out of you......lolo, enjoy