Jovan convinces the other members of the Petsitters Club that rescuing a sad looking donkey standing alone in the field is just as important as exercising a very energetic puppy.
The Petsitters find themselves in trouble when Matthew, insisting that he knows horseback riding, agrees to exercise an independent-minded pony in his owner's absence.
The members of the Petsitters Club find themselves very busy when they agree to take care of a pampered Yorkshire Terrier and the "virtual pup" of a classmate who has to have his tonsils out.
When Beastly Basil goes to summer camp, he is afraid everyone is going to find out his terrible secret, but instead he is shown what true friendship really means.
When his baby sister arrives and nobody pays attention to Denzil anymore, he is ready to run away from home, until he discovers how proud he is to have a sister who is the most disgusting monster around.