Books in the Green Band series

Mucky is a messy horse. He is so messy that the other horses refuse to share his field with him. Mucky thinks that if only he were a beautiful unicorn then the other horses would like him. Owl overhears Mucky's wish and with the help of the cows and frog, he makes his dream come true... until it rains and Mucky's beautiful white coat washes away. Mucky realises he doesn't need to be a unicorn, because he has wonderful friends already who love him for who he is. Illustrated by Andrea Ringli.