Answer:
My first is a heir; My second's a snare; my whole is the offspring of fancy; which I sent out of play upon Valentine's day As a token of love to my Nancy.
I have a mouth on my head and eat everything.
What gets whiter the dirtier it gets?
2 in a corner 1 in a room 0 in a house but 1 in a shelter.
I can go through glass without breaking it. What am I?
It's what light turns into in the night