should be a strong actor, singer and mover. She should be a natural leader with dramatic flair who is unafraid to be mean and bossy.
Roger is a songwriter and owner of the Dalmatians. He is soft spoken yet confident and displays leadership in a quiet and composed way, contrary to frenetic Cruella.
Anita is the sweet, nurturing owner of the Dalmatians and a painter. This role requires a strong actor with a good singing voice.
Horace and Jasper provide comic relief a la Abbott & Costello or Laurel & Hardy. They should be good singers and strong actors.
Your Canine Narrators should have loud speaking voices and strong stage presence. Although these children need not be the strongest actors/singers (unless they are doubling as London Dogs), they should have a good memory for lines and more complicated blocking.
Pongo and Perdita are the Dalmatian parents. These parts require good actors, but not necessarily strong singers.
Sergeant Tibbs is the army cat who rallies the London Dogs to rescue the Dalmatian Puppies. This role can be played either by a girl or a boy and, if you have a small cast,