Mr. Herriot appears to be a caring and observant veterinary surgeon who has the best interests of the animals he treats at heart. He demonstrates common sense in recognizing the source of Tricki's health issues and providing practical advice on how to resolve them. He also exhibits patience and understanding in dealing with Mrs. Pumphrey's concerns and indulgences. Mr. Herriot can be considered tactful as he navigates the delicate situation with Tricki and Mrs. Pumphrey. He is sensitive to her feelings and manages to convince her to hospitalize Tricki for the dog's benefit. Throughout the story, Mr. Herriot remains professional and compassionate, even as he benefits from the gifts sent by Mrs. Pumphrey. Ultimately, he successfully helps Tricki recover and tactfully handles the situation without alienating or upsetting Mrs. Pumphrey.