Answer:
My second is performed by my first. A thief by the marks of my whole might be caught. What am I?
What breaks when you say its name?
I had a bright start, but I couldn't take the pressure. I consume everything, yet I don't eat anything. What am I?
You buy me to eat, but never eat me. What am I?
you cannot keep me until you have given me
Runs over fields and woods all day. Under the bed at night sits not alone, With long tongue hanging out, Resting at your feet until we go for a walk