Good Riddles

Question: I'm fat and I'm round and I cause much joy, I'm often a dogs favorite toy. What am I?

Question: How far can a dog run into the woods?

Question: There are 50 crows on a wire, a hunter shoots and kills three. How many are there left on the wire?

Question: When it's warm it has something warming it, but when it's cold it's naked. What is it?

Question: Imagine that you enter a room, but the door shuts behind you and you are locked inside. The room is 3 meters high, and 6 meters x 6 meters as a square form. It is dark, the floor is metal just like the walls and the ceiling. You cannot destroy the walls, ceiling, floor or door. How to you get out?