While out walking a dog, Adam notices a shaggy, tiny pony standing alone in a field. Day after day he sees the same lonely pony. The kids in the Pet Rescue Club discover that the pony used to be the companion to a racehorse. But now that the racehorse has retired, the owner has no use for the little pony. Looks like another case for the Pet Rescue Club! Will Adam, Janey, Lolli, and Zach find a way to help?