Muddle Earth (HB) by Paul Stewart
Welcome to the weird and wonderful world of Muddle Earth...As the third moon rises over Muddle Earth's Perfumed Bog, the twinkling lights are lit on a small houseboat, home to a wizard, Randalf, and his familiar, a very sarcastic budgie called Veronica. Randalf is in trouble - he's stony broke. He's just spent his last silver pipsqueak. There's only one way for a wizard to make cash on Muddle Earth - and that's by doing some magic. There's just one problem: Randalf has lost his spell book. He's just got a fragment of paper with half a spell on it - telling him how to summon a Great Warrior Hero. The last one, Quentin the Cake-Baker, wasn't a great success. But this time, it's going to be different. And life is about to change beyond recognition for an ordinary schoolboy on ordinary earth - Joe Jefferson - and his dog, Henry. Welcome to a world of ogres and goblins, batbirds and pink stinky hogs, flying cupboards and terrifying teddy bears...