Answer:
I have to be broken before I can be used
Canine children.
My first is in some but not in all. My second is in tiny but not in tall. My third in little but no in big. My fourth in port but not in pig. My whole is made in nature's way. For clothing rugs used every day.
Everyone in the world needs me. They generously give me but never take me. What am I?
I twist and turn and leave a loop. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.