This is narrated by Mr. Herriot as he is a vet doctor he knows how to cure a dog ! This is the very simplest question.

There are many factors that contribute to a person's identity, including:

1. Family and upbringing: The environment in which a person is raised, the values and beliefs instilled by their family, and the cultural background they come from all play a role in shaping their identity.

2. Education and experiences: The knowledge and skills acquired through formal education and life experiences shape a person's identity. The various interactions and opportunities a person has throughout their life can greatly influence their sense of self.

3. Society and culture: The society a person lives in, including its norms, values, and expectations, can have a significant impact on their identity. Cultural traditions, religious beliefs, and social structures all contribute to shaping one's sense of identity.

4. Personal characteristics and traits: A person's personality, talents, interests, and abilities all contribute to their identity. These individual characteristics help to differentiate one person from another and contribute to their unique identity.

5. Gender, race, and sexuality: Factors such as gender, race, and sexuality can also influence a person's identity. These aspects of a person's identity can shape their experiences and how they are perceived by others.

6. Personal beliefs and values: A person's beliefs and values, whether they are religious, political, or philosophical, greatly influence their identity. These beliefs and values often guide a person's actions and decisions, shaping their sense of self.

It is important to note that identity is a complex and multifaceted concept, and each person's identity is unique and influenced by a combination of these factors and many others.