Karen McCombie 
You Me and Thing: The Great Expanding Guinea Pig & Beware of the Snowblobs! 

Two great books in one featuring magic, mix-ups and muddles!Join Ruby, Jackson and Thing on not one but two great adventures in this brilliant bumper book. See what havoc Thing causes when Ruby and Jackson sneak it along on a trip to the petting zoo in The Great Expanding Guinea Pig. And in a seasonal spectacular, Thing helps Ruby and Jackson defeat some nasty bullies in Beware of the Snowblobs!