i'm glad I'm not the only one! Sing with the dogs too. We have regular sings so it doesn't take much to get them going especially the GSD.Mine think it's funny when I do it and come watch me with weird looks on their faces.
It took me almost a month of howling to get my Aussie mix to talk. He will speak on command now. My gsd knows what I'm asking, but she will only speak if she is jealous of the attention I'm giving the boy when asking him to talk.