Richard Raffan has a new book out, Turning Toys which I just got. A pull toy like this is one of the projects in his book.
I really like his books because he provides such good detailed explanation on what, why and how of turning. So I saw this project and just had to make one for my youngest grand daughter, Poet, 2 1/2 years old. The body is Bradford pear, the tail is walnut and the wheels are osage orange. Finish is Mylands friction polish.