New York City teenagers Joy, Maya, and Carolyn struggle with inevitable change when Carolyn, still coping with her mother's death, learns that her father has a girlfriend, and Joy finds out that her wealthy father has lost his high-paying job.
The Pony Pals find illegal animal traps on the trails of Ms. Wiggims estate and decide they have to catch the trappers before they hurt any more animals.
When the circus comes to town, all the Pony Pals are excited. When Anna finds out the circus pony can't perform, she knows that Acorn can do the act. Anna is asked to be in the circus, but her friends worry that it has become more important to her than they are.
Since Anna loves Ms. Wiggens' pony Winston, she is happy when Ms. Wiggens asks the Pony Pals to take care of him while she is away. Winston is very sick and may die, and now Anna needs her fellow Pony Pals more than ever.
When the Pony Pals discover that Kim's new pony is blind, the girls work together to train the animal and ensure that Dandy will have a long life with their friend.
When the Pony Pals find a stray cat, they let him stay in Dr. Crandal's animal clinic until they can find him a good home, but when the clinic catches fire, the cat disappears and the Pony Pals have to find him before he gets seriously hurt.
Pam's new job of schooling ponies is taking time away from her own pony, Lightning, and from her friends Lulu and Anna, who are angry that she never goes horseback riding with them anymore.
