Reading and learning are more effective when they're fun. I knew it would help to have a cuddly, cute character to make the book fun to read. The answer dog is also very smart and encourages children to ask questions. Asking questions is good because what you know helps you grow. He serves an important role as a transitional object.
Children have trouble with transitions at that age.
In the face of those tricky transitions, it always helps to have a familiar friend along for the ride. That's why you see kids clutching smelly, dirty blankets. Angus is on every page, not because he's cute, but because he's comforting. He'll also be there when it's time for a new experience. For this age group, familiarity breeds comfort.