Having added the puppy Puddle to her growing menagerie of cat and rabbit, animal-mad Sophie makes friends with a Vietnamese pot-bellied pig and a gray pony named Bumblebee.
Because of her size, Great Cat, the biggest cat that ever lived, causes the neighbors to fear for their children's safety. Therefore, Great Cat and Toby move to an island where they rescue a sinking boatload of children.
Pavel saves the life of the enormous dog he finds half-frozen in the snow, but since only the tsar himself keeps wolfhounds, Pavel fears he will be punished for stealing.