The Junior Vets are nearly ready to graduate from Vet School. But, with no clear leader, there's still everything to play for as Paul tries to decide who will become Head Vet. The Junior Vets need to find out why Tino the Horse can't walk properly. Plus, they help remove a large lump from the throat of Zoe the Schnauzer Dog. And Pollux the Alpaca is going bald - can the Junior Vets get to the bottom of the problem?