Dog on a Broomstick

This is a beginner reader tale about a witch who advertises for a new cat—and employs a dog instead. He can't scratch, but he can dig big holes. He can't hiss and spit, but he can growl, dribble, and cover everything in muddy paw prints. The countdown has started for the Grand Spell Contest and the Witch's cat has run off to be a cat-food tester! Then the Dog appears on her doorstep. Will the witch let the dog help her at the Grand Spell contest? And, most importantly, can they both fit on her broomstick?