All Creatures Great and Small (1975)

James Herriot is a vet in Yorkshire, England, during the 1940's. He is assigned to the practice of Siegfried Farnon, who—together with his mischievous brother Tristan—already have a successful business. James undergoes a variety of adventures during his work, which are just as often caused by the characters of the county, including the Farnon brothers, as the animals in his care.

Unfortunately the movie All Creatures Great and Small is not yet available on HBO Max.