All Creatures Great and Small - Series 7: 12. Promises to Keep

Tristan returns from Ireland to become the butt of a practical joke.

Tristan accidentally injects a farmer with a vaccine intended for his cows.

The vets are baffled by Biggins, who keeps asking them to treat perfectly healthy cows.

Bill Shadwell is about to retire, but he is at odds with his son and successor.

Tristan's old college friend comes to stay, but his visit has to be kept a secret.

James Herriot treats a dog that wags its tail when it is angry.

James rescues a client from imminent arrest.

Mrs Pettinger's cat goes missing.

Siegfried finds out who shot Jacob Pearson’s dog.

James is not pleased that Tricki Woo is coming to stay.

Mrs Pumphrey's great-niece Angela comes to stay.

It is Christmas 1953, and an outbreak of foot-and-mouth disease has hit the Dales.