The principal vet at the Darrowby practice who hires James and often creates an eccentric and unpredictable environment. Despite his chaotic ways, he serves as a steady influence in James's journey.

Siegfried's younger brother, a veterinary student who favors leisure over hard work, often playing practical jokes and shirking responsibilities. Despite their differences, he and James maintain a friendly relationship.

A difficult Scottish vet, remembered for his cantankerous nature and troubled personal life, highlighting by contrast the aspects of James's pleasant life in Yorkshire.

The secretary hired to bring order to the chaotic practice, persistently trying to implement efficient practices amid Siegfried’s disorganized habits.

The affluent owner of a pampered dog, Tricki Woo, who indulges James with gifts and social invitations, offering a glimpse into the high life of small animal veterinary care.

A farmer's daughter with a modern spirit, catching James’s interest as they share a fondness for Yorkshire. Her support helps James overcome his self-doubt.