Answer:
I make everyone blind. You can't see me but I will always come back for you. What am I?
Why are there no living cats on Mars?
I am round. I have only one line. Circle is not my name indeed. What am I?
I come without being fetched at night, hide away as soon as daylight strikes. Although I may look small, I am much mightier than what you can imagine. What am I?
I sit in a corner while travelling around the world.
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