Hannah, Lisa, and Sofia are very worried because Sarah has been acting very strangely for some time. She is very quiet and withdrawn. Of course, the three of them are trying to find out what has changed their friend and how they can help her, but Sarah doesn't want to talk about it. During a ride through the Peppertree Forest, Blossom, Storm, Mystery, and Cayenne also start behaving very oddly. They all push in one direction, and when the friends let them run, they discover a female dog in the thicket that has apparently just given birth to some puppies. Sarah, Sofia, Hannah, and Lisa take the animals to Arun Shah at the nearby animal rescue center, where the dogs are first taken care of. But where do they belong? And what is going on with Sarah? A new case for the Horse Club!.