Blythe rejects the notion of her dad going on a date to a charity ball, while Penny Ling struggles to voice her disapproval of an outfit Blythe designs for her to wear at the ball along with the rest of the pets.
Suspecting that he has become too serious for his own good, Russell loosens up by creating an alter ego, dubbed "Fun Russell". Meanwhile, Blythe finds her friend Sue mimicking every aspect of her personality unsettling.
Blythe attempts to be the peacekeeper between Zoe and her old rival Madame Pom when arrives at day camp, all the while Penny Ling and Vinnie nearly destroy the shop while practicing for their new group dance routine. Likewise, Mrs. Twombly goes on a rampage in search of her favorite cleaning spray.
Vinnie's tail falls off in an act of autotomy, and after a series of trials to find an adequate replacement for it, he is shocked to find that he becomes better at dancing without one. Meanwhile, Zoe and Pepper become rivals over the theme for a party meant for Penny Ling.
When Blythe gets accepted into the junior program at a fashion school, she, along with her family and friends from school and at Littlest Pet Shop, have to bode with the anxiety of her leaving.