lol my cocker spaniel also howls when old news paper man passes by.. so does all the dogs along my streets. i like to disturb him when he is "singing" i walk behind him and say OIII u singing ah! then he'll be shy and show the got caught red handed face. =P  sometimes when i'm outside and i can hear the newspaper man coming from far then i'll ask him OI OI your karaoke time faster go sing. and he'll walk to the gate area and sing till his voice break...