A Rabbit Called Wish by Claire Barker (Illustrated by Ross Collins)

Knitbone Pepper is a friendly ghost dog, haunting the crumbling Starcross Hall with a gaggle of other ghostly pets.

When Lord Pepper buys an antique top hat he brings home a ghost rabbit looking for a young magician called Ernest Salt. But there's skulduggery at play and Ernest's guardians are determined to keep his identity secret...