Answer:
Take it and you will lose or gain more than the others.
I reach for the sky, but clutch to the ground. Sometimes I leave, but I am always around. What am I?
A dragon's tooth in a mortal's hand, I kill, I maim, I divide the land.
I fly yet I have no wings. I cry yet I have no eyes. Darkness follows me. Lower light I never see.
I am round as an apple, deep as a cup. All the King's horses can't pull me up. What am I?
Those with eyes bigger than their stomach will definitely leave the restaurant with one of them. It is named after a house pet as well.