There may be many reasons why a dog keeps licking people. Here are some common explanations:

Express love And closeness: Licking is a way for dogs to express affection and closeness. They may lick to show friendship and intimacy to their owners.

Seeking attention and interaction: Dogs may want attention and interaction from their owners, and licking is a way to get attention.

Habit or instinct: Some dogs may develop a habit of licking people, which may be their instinctive behavior or learned from early experiences.

Taste or smell: Dogs have a very sensitive sense of smell. They may be interested in the taste or smell of their owners and lick people to explore and sense.