Dr. John Dolittle
Archer Dolittle
Dr. Mark Weller
Calloway
Dr. Gene Reiss
Lisa
Dr. Fish
Maya
Charisse
Dr. Litvack
Jeremy
Diane
Mrs. Parkus
Lucky (voice)
Rodney (voice)
Tiger (voice)
Owl (Voice)
Rat #1 (Voice)
Rat #2 (Voice)
Female Pigeon (voice)
Male Pigeon (voice)
Prologue Dog (voice)
Raccoon (voice)
Skunk (voice)
Drunk Monkey (Voice)
Compulsive Dog (Voice)
Old Beagle (voice)
Pound Dog (voice)
Possum (voice)
Heavy Woman's Dog (voice)
German Shepherd (voice)
'I Love You' Dog (voice)
Bettleheim the Cat (voice)
Baby Tiger (voice)
Pig (voice)
Penguin (voice)
Intern
Patient at Hammersmith
Beagle Woman
Woman
Vet's Assistant
Security Guard
Mr. Galvin
Reporter
Cop #1
Cop #2
Blaine (uncredited)
Circus Clown (uncredited)
Patient at Hammersmith (uncredited)
Drunk Monkey (uncredited)
Jumping Boy (uncredited)
Receptionist
Busboy
Policeman
Animal Control Officer
3-Year-Old John Dolittle
Reverend
Goat (voice)
5-Year-Old John Dolittle
Mounted Policeman
Orangutan (voice)