To those that have "vocal" breeds...?

OMG my Siberian Husky does that too! his name is Sammy and when we leave him outside for to long when he is alone he will start howling! its kind of a "arooooing" though. and once at a birthday party for my mom we were singing "happy birthday" and he started to sing with us! We laughed and he smiled...does your dog smile? mine seems to do it all the time....