Answer:
I'm the source of all emotion but I'm caged in a white prison.
I fly when I'm born. I lie when I'm alive. I run when I'm dead. What am I?
Canine children.
A dagger thrust at my own heart dictates the way I'm swayed. Left I stand and right I yield to the twisting of the blade. What am I?
I have an eye but cannot see. I take time to generate and can dissipate in seconds. What am I?
I run through hills. I veer around mountains. I leap over rivers. And crawl through the forests. Step out your door to find me.