The Junior Vets need to prove they are top vets in the making. Can Morgan focus on the task at hand as they try to get to the bottom of Benji the dog's painful pee problem? Can Lauren handle barn-based surgery when she is called down to the farm to help a calf with a hernia? Also, Gary the axolotl arrives at the school with a mysterious lump. Can the Junior Vets work out what's wrong?