Answer:
Always in you, sometimes on you. If I surround you, I can kill you. What am I?
I can run but not walk. Wherever I go thought follows close behind.
I go around and in the house but never touches the house
What dress does everyone have, but no one wears?
I am one small little piece of paper yet sometimes hold lots of value. I am all you need to get in to big events but will cost you. I am an important part of travel. And if lost you're not coming.
Runs over fields and woods all day. Under the bed at night sits not alone, With long tongue hanging out, Resting at your feet until we go for a walk