Называется "The Princess and the Pea".

The Lion and the Mouse

Lion and the Mouse сказка на английскомOnce when a Lion was asleep, a little Mouse began running up and down upon him. This soon wakened the Lion, who placed his huge paw upon him and opened his big jaws to swallow him.
The Lion was so tickled at the idea of the Mouse being able to help him, that he lifted up his paw and let him go.

Sometime later a few hunters captured the King and tied him to a tree while they went in search of a wagon to carry him on.
Just then the little Mouse happened to pass by, and seeing the sad plight in which the Lion was, ran up to him and soon gnawed away the ropes that bound the King of the Beasts. «Was I not right?» said the little Mouse, very happy to help the Lion