Answer:
This is needed both for courage and hardcover books.
Gets rid of bad ones, short and tall. Tightens when used, one size fits all.
I wear a red robe, with staff in hand, and a stone in my throat.
My tongue hangs out as I run over fields and streets all day. I get tied up every morning and untied at night.
As round as an apple. As deep as a cup. All the king's horses can't pull it up.
People take me on walks and I run and have fun. What am I?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?