Answer:
My teeth are sharp, my back is straight, to cut things up it is my fate.
I am the red tongue of the earth, that buries cities.
I am a precious little thing, dancing and eating all the time. Watch me from a distance, so you can feel my warm and gentle love. But don't come to close or my next meal you could be!
It can cause deflation of tires when dropped from the rear of spy cars.
You saw me where I never was and where I could not be. And yet within that very place, my face you often see.
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.