Answer:
What kind of fish chases a mouse?
Slithery critters with a taste for dirt.
A mysterious, fantastic creature, It has one defining feature, And for humans at their worst, In their eyes it's just a horse
What follows a dog wherever it goes?
From that which comes within itself, It builds its table on my shelf.
They come to witness the night without being called, a sailor's guide and a poet's tears. They are lost to the sight each day without the hand of a thief.