The Prince and the Porker by Peter Bently

Pignatius Pig loves good food and when he sees ten buns cooling on the windowsill, he's sure he can steal one and no one will notice.  But once he has one, he eats them all!

Abrams shared a copy of this book with me for review (thank you).  It has been published and you can grab a copy now.

When the buns are gone, he sneaks into the kitchen.  Before he can do much damage, the cook finds him.  He runs into the castle to escape her.  With various servants after him, he hides in a bedroom.  There's a dress-up chest in there with clothes and wigs.  He dresses up and tries to escape again.  But it's not to be.  He gets caught.  Imagine how he feels when they think he's the prince!  Now he's really in hog heaven.  And, boy, does he eat!

Now imagine his despair when the real prince shows up...