The Thief

I am invisible.
I creep quietly and no one sees me, my head hunkers down as
I sneak throughout the house.
I am the colour of darkness, awaiting my moment to strike.
I pause.  There is no sound.
I move slowly to prevent any evidence of my movements.

Suddenly,

I hear the master.  There is no time to waste.

My desire has overcome my obedience.

I charge forward.
I am exceptionally fast.

Her steps come closer.  

I jump, snatch the prize, and delve into it's deliciousness.
I have won!
I have -

"Mom!  The dog stole the last of the pizza again!"

"Bad dog!"

My powers have been stripped. 

I am clumsy, tripping over my tail.
I am embarrassed by the ticking of my feet, and the jingling of my tags as
I race to the mat.
I bow my head in guilt, and thump my tail for mercy.

And then give a big belch.

Satisfaction.

I am again invisible...