The angry dogs are offending him because he is blue and dogs are teasing him with this song: Trenti-brenti-trenti-ta! Who is this? All from nose to tail Very blue? blue ear, blue belly, Blue forelock! How are you, darling?! Blue! Blue! We don't want to play with you! Hasn't happened before Blue dogs. You're disgracing the whole yard You are the undisputed enemy