Answer:
I am round. I have only one line. Circle is not my name indeed. What am I?
What comes in many different sizes but is always only 1 foot long?
What invention lets you look right through a wall?
I am carried by mad animals.
I run around the streets all day. Under the bed or by the door I sit at night never alone. my tongue hangs out waiting to be fed during the day.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.