At Animal Ark, Mandy Hope helps her parents treat animals of all shapes and sizes. Even outside the clinic, Mandy can't resist helping any animal in need.

Mandy and James are having trouble finding enough time to give Chamomile -- a mare whose owner has left the country -- all the attention and exercise she needs. When they meet Rhian, a girl who lives next to Chamomile's field, they hope she will help them out. But Rhian doesn't want to get to know the horse -- and she doesn't want to tell anyone why not. Can Mandy convince her new friend to care for Chamomile -- or will the horse have to be sold?

Mandy and James try to help twin foals that are sick while attempting to keep Drysdale Farm from financial ruin.

Mandy and James are excited to help with a team of mustangs and a rock video, but must nurse the lead horse, Cougar, back to health after he develops a strange, life-threatening illness.

At Animal Ark Veterinary Clinic in the New Forest in England, Mandy has to save the horses from a terrible accident on Christmas Eve.