One of the few British shows I enjoy, this show is based on the novels of Alf White, who wrote under the pen name of James Herriot. The episodes can be a bit slow paced, but the characters are enjoyable and warm. At this point, I've only watched the original three seasons, which ran from 1978-1980.
The show and the novels that they were based on were based on Herriot's experience as a veterinary surgeon in a small country practice prior to the Second World War. Herriot begins as an assistant in the family practice operated by Sigfried Farnon. As the show progresses, he works his way up to being a full partner.
The show may be a bit dated since it was produced in the late 70s-early 80s. Animal lovers and anyone who appreciates character driven storylines will appreciate it.