Answer:
What can be big, white, dirty and wicked?
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 have legs but never walk, I may have flowers but no soil, I hold food but never eat.
Iron on a mammal. Mammal on your feet.
What is it something that you always have but you always leave behind?
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?