Answer:
What is so delicate that saying its name breaks it?
I run through hills. I veer around mountains. I leap over rivers. And crawl through the forests. Step out your door to find me.
I go from house to house a messenger small and tight. Whether it rains or snows I sleep outside at night.
In the sun I like to play; in the rain I goes away; walk or run I always follow; in the mud I always wallow.
I hold two people together but touch only one. What am I?
What never gets any wetter no matter how hard it rains?