This third book in a series continues the adventures of Zack, a handsome and intelligent donkey, and his donkey friends Zelda, Willie, and Pedro. Zack and his three donkey friends are faced with a new problem. Unless the horses on Mr. Bumbys horse ranch join the farm animals at the new Donohue Historic Farm Center, the center is not likely to be successful. Believing that the horses have more talents than just running races, Zack and his friends must find a way to discover those talents. Again, using one of Profound Pigs brilliant ideas, Zack and his friends begin a new positive mission. With the help of Profound Pigs uncle, Professor Pig, they begin to teach the animals to look for the good in others. The idea is to see a good quality or talent in another animal, tell them about it, and ask them to use it to help others. With this new idea, the horses do discover their other good talents and decide to use them at the new Donohue Historic Farm Center. This new idea of Professor Pig is called validation of others. It is so successful that it becomes the new mission of Zack and the Validators, the name Zack and his donkey friends take on as a new singing group.
