Answer:
Lighter than what I am made of, More of me is hidden Than is seen.
I can be short and sometimes hot. When displayed, I rarely impress.
Inside a burning house, this thing is best to make. And best to make it quickly, before the fire's too much to take.
You throw me out when you want to use me and you take me in when you don't want to use me. Who am I?
Long legs, crooked thighs, little head, and no eyes.
People take me on walks and I run and have fun. What am I?