Answer:
White fat and fluffy, May even look like a puppy. Seems heavy but is light, Floats about without a worry, But if it turns dark you have to hurry!
Turn us on our backs and open up our stomachs you will be the wisest of men though at start a lummox.
It is worldwide, but once only a spider could weave one
A hole in a pole, though I fill a hole in white. I'm used more by the day, and less by the night.
A man shot two arrows at its center and missed both times, but using a sword swung once at its center and hit it twice.
What is so fragile that saying its name breaks it?