I believe I do have a timeline of events that you might find revelatory.
Newt is filling in for Gally at a Midnight & Noone performance.
He and Susanna perform the original version of Woof, Woof, Woof, which tells the story of Albert Small.
Albert was a renowned bird impressionist as a child. However, when his voice breaks, he can no longer reach the notes needed to imitate birds like the nightingale. So that he can continue to perform, he changes to doing dog impressions instead.