Answer:
You can only have it once you have given it.
At night I come without being fetched. By day I am lost without being stolen.
Walk on the living, they don't even mumble. Walk on the dead, they mutter and grumble.
What month of the year has 28 days?
I scribble forms of the finest letter, And repel elements of the harshest weather. I am an arrow-aimer and a dust-breaker.
People take me on walks and I run and have fun. What am I?