According to IMDb, the voice actor recorded all the dogs' barks in the film. The movie was based on a novel. Like most Disney films, "101 Dalmatians" was based on the 1956 novel by Dodie Smith.

Dallas McKennon, an exuberant character actor and voice actor who helped enliven ... “Lady and the Tramp,” “Mary Poppins” and “101 Dalmatians,” among others. At Disney theme parks ...

Her versatility in both dramatic and comedic settings, as well as her powerful scene-stealing voice really offers us a Cruella that we believe will help make THE 101 DALMATIANS MUSICAL a truly ...