Wulfie: Stage Fright by Lindsay J Sedgwick
With a best friend like Wulfie, anything is possible!
Libby lives a lonely life with her mean stepmother, her ineffectual inventor father, and her nasty step-brother, Rex. Then she makes a new best friend: Wulfie, a purple wolf-like creature who can shrink down very small or grow very big (usually on purpose, often not).
Wulfie is a sweet but mischievous character who helps get Libby out of difficult situations at school and to get revenge on Rex - all the while just managing not to be discovered.
From the Award-winning creator of ground-breaking animated series Punky comes a tale of magic, mischief, and most importantly, friendship.