Both my GSDs sing and talk....the breed is known for it! Killian always howls at sirens and Shiloh tries to. Now, after all these years, Killian has added Shiloh noises to his howl and Shiloh is still trying to imitate Killian (she's not as good at it as Killi). LOL Boy are they a pair! Can't watch COPS without muting the sound.
My first GSD used to sing with me and imitate the fluctuations in the pitch. It was hilarious. If there were Cute Pet Tricks back then, he would have been on it!!! LOL