Answer:
What is never used unless it's in a tight place?
My love, when I gaze on thy beautiful face. Careering along, yet always in place, the thought has often come into my mind. If I ever shall see thy glorious behind.
A muttered rumble was heard from the pen, and I, in my walking stopped to look in. What was this I saw? A massive beast, hoofed, and jawed. With spikes upon its mighty brow, I watched as he struck the turf and prowled. And yet for all of his magnificence, he couldn't get out of that wooden fence.
What is as big as you are and yet does not weight anything?
Iron on a mammal. Mammal on your feet.
I have two eyes in the front and a lot of eyes on my tail