Bello The Blue Dog Daybill Poster 1976 Aka Once Upon A Time
Daybill Poster. Bello The Blue Dog (German: Maria d'Oro und Bello Blue or Once Upon A Time) is a 1973 West German animated musical film written and directed by Roberto Gavioli and Rolf Kauka. The story is based on the German fairytale Mother Hulda and the famous Cinderella. It was released in the USA in 1976 and other English speaking nations there-after.