Episode 4

Lorien is taking a team of students to meet an unusual patient who lives in a local back garden. Rusty is a large and very friendly kunekune pig whose toenails need trimming. Equine surgeon Neil is helping Chester Zoo's vet with one of their rarest creatures, an onager named Sophie who is off her food. After sedating her, Neil inserts an endoscope inside her mouth and immediately sees the problem - her teeth are digging into her tongue.