Answer:
If you lose me you may cause people around you to lose me too.
As I went over London Bridge I met my sister Jenny; I broke her neck and drank her blood and left her standing empty.
Skirts for men.
Draw fire or fill me; I'm still empty.
In all the world, none can compare, I am a tiny weaver; my deadly cloth so silky and fair. What am I?
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