Many fault this entertainment colossus for being slow to introduce a  black princess as a peer to Cinderella and Snow White. (There is one  now: Tiana, from “The Princess and the Frog.”) The racial stereotyping  in early animated movies like “Dumbo” lives on through DVD rereleases.  African-Americans can also bring up “Song of the South,” a 1946 film  that Disney has labored to keep hidden because of its idyllic depiction  of slavery. 
Disney has worked overtime in recent years to leave that past behind,  and a surprising groundswell of support from black viewers for a new TV  cartoon called “Doc McStuffins” is the latest indication that its  efforts may be paying off. 
Aimed at preschoolers, “Doc McStuffins” centers on its title character, a  6-year-old African-American girl. Her mother is a doctor (Dad stays  home and tends the garden), and the girl emulates her by opening a  clinic for dolls and stuffed animals. “I haven’t lost a toy yet,” she  says sweetly to a sick dinosaur in one episode.        
