Professor Noel Fitzpatrick treats a border collie in a lot of pain with a suspicious lump on its ankle. However, the dog's recovery does not go to plan and proves extremely challenging. A short-haired cat arrives with a sore hip from jumping off the sofa, and it seems a hip replacement may be the best option, and a golden labrador is rushed into Fitzpatrick's sister clinic in Guildford with a lump growing on its side.