Answer:
I am a sharp looking horse with a flaxen tail. The longer I run the shorter my tail becomes.
I climb higher as I get hotter. I can never escape from my crystal cage.
What force and strength cannot get through, I with my unique teeth can do. What am I?
I give people a huge fright but at the end I'm sweet. I normally celebrate at night when there's less heat.
Part carbon part water I am poison to the fishes. Many falsely claim my name I am the pause that refreshes.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.