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.

Broadway In Chicago is excited to announce Drama Desk Award Winner Rachel York has joined the cast ... stealing voice really offer us a Cruella that we believe will help make The 101 Dalmatians ...

When writing the book for 101 Dalmatians The Musical ... because I wanted whoever was cast in it at various stages, across the UK, to be able to use their own voice, to bring the show to life.