CARTOON RIDDLE NO FURTHER A MYSTERY

131. A brother and sister had been standing on opposite sides of the river. Once the brother called her, the sister crossed the river to satisfy him. But she didn’t get soaked. How Is that this achievable?Dilemma: Rework the term "CAT" to the term "DOG" by shifting just one letter at a time, with Every single step leading to a valid English term.