Answer:
I build up castles. I tear down mountains. I make some men blind. I help others to see.
Of these things - I have two. One for me - and one for you. And when you ask about the price, I simply smile and nod twice.
Men have one, women two, and when they become family, it’s three. What is it?
My teeth are sharp, my back is straight, to cut things up it is my fate.
My tongue hangs out as I run over fields and streets all day. I get tied up every morning and untied at night.
People take me on walks and I run and have fun. What am I?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?