Dr. John Dolittle
Lisa Dolittle
Charisse Dolittle
Maya Dolittle
Eric
Secretary
Eldon (as James L. Avery)
Eldon's Wife
Eugene Wilson
Riley / Alligator
Judge B. Duff
Joe Potter
Logger / Nature Show Narrator
Animal Control Officer / Dog / Animal Groupie #3 / Forest Animal (voice) (as Ken Campbell)
Woman
Farmer
Farm Worker
Yuppie Man
Newscaster
Bear Announcer
Shamu Trainer (as Lisa Hugueley)
The Crocodile Hunter
Klondike Dave Delivery Man (as R. Doug Seus)
Waitress (as Louise Lennon)
Chihuahua Lady
Guy Throwing Frisbee
Archie (voice)
Ava (voice)
Pepito (voice)
Joey the Raccoon (voice)
Possum (voice)
Lennie the Weasel (voice)
Squirrel (voice)
Fish (voice)
Fish (voice) (as Melique T. Berger)
Dog / Animal Groupie #2 (voice)
School Fish #2 (voice)
Horse Race Announcer (voice)
Seeing Eye Dog / Wassup Fish / Mouse (voice)
Giraffe (voice)
Sonny (voice) (as Michael E. Epps)
Bandit / Forest Animal / Animal Groupie #1 (voice)
Male Tortoise (voice)
Bee (voice)
Zoo Bear #1 (voice) (as Cedric 'The Entertainer')
Bird (voice)
Deer (voice)
Girl Bear Cub (voice)
Boy Bear Cub (voice)
Animal Groupie #4 / Forest Animal / Dog (voice)
Drunk Monkey (voice)
Rat #2 (voice)
God Beaver (voice)
School Fish #1 (voice)
Female Tortoise (voice) (as Reneé Taylor)
Zoo Bear #2 (voice)
Boy Bear Cub
Girl Bear Cub
Archie
Bear (uncredited)
Frisbee Thrower in Park (uncredited)
Lucky (voice) (uncredited)
Zoo Visitor (uncredited)
Drunk Monkey (uncredited)
Raccoon puppet (uncredited)
Governor of California (uncredited)
White Wolf (voice) (archive sound) (uncredited)