A man stands on one side of a river, his dog on the other. The man calls his dog, who immediately crosses the river without getting wet and without using a bridge or a boat. How did the dog do it?

What has teeth but Cannot bite?

What has a neck but no head?

Everyone has it but no one can lose it, what is it?

What is the only question you can't answer yes too?

What has many keys but can't open a single lock?

What is black when it's clean and white when it's dirty?

What has a bottom at the top?

What's not alive but can die?

What has legs but doesn't walk?

Who has 13 hearts but no organs?

What has an eye but can not see?