What cant Truman get on the ferry to harbor island?

In "The Truman Show," Truman cannot bring his dog, a golden retriever named "Sophie," onto the ferry to Harbor Island. This restriction symbolizes the control and limitations placed on Truman's life by the show's producers, highlighting his lack of freedom and the artificial nature of his reality. The ferry ride represents a boundary he cannot cross without facing the consequences imposed by the constructed world around him.