Narinder Dhami 
Animal Crackers [EPUB ebook] 

When Sanjay gets a bump on his head from the school bully, he wakes up to find that everyone in the playground has turned into an animal! The headmaster’s a polar bear and Sanjay’s best friend is a sheepdog. Even the ambulance that comes to take him to hospital is driven by a gorilla and the paramedic is a penguin…Seeing his schoolmates in a new light gives Sanjay a clever idea about how to defeat the bully… Will Sanjay’s wily plan work, or has the whole world gone animal crackers?