James is forced to take in Mrs Pumphrey's pampered Pekingese. Tristan prepares to return to university, but needs Siegfried's help to pay for his accommodation, but Siegfried insists he must first prove he is serious about being a vet. James treats the Aldersons' prize bull, and Helen rewards his efforts with some unusual home baking.

It's the Darrowby Show and James is pleased as punch that he has been given the honour of Attending Vet. But Siegfried and Tristan know the job is a poisoned chalice and reckon James won't last the day without throwing in the towel.

It's an important day for Tristan in more ways than one, as he celebrates his birthday and Siegfried gives him new responsibilities as a vet. Tristan has to withstand the pressure and succeed in the challenge set by his older brother before returning to Skeldale for his birthday festivities. Meanwhile, Mrs Hall reminds James that he needs to tell Helen some home truths.

James starts to behave out of character while examining Tricki, and his health takes a turn for the worst. Meanwhile, Siegfried, needing an extra hand in Carmody's absence, recruits a reluctant Tristan to help.