Suggestions by @nephelodeon

Mark Ruffalo

as Dr. Gene "Geno" Reiss in Dr. Dolittle

Michael Douglas

as Mr. Calloway in Dr. Dolittle

John Goodman

as Dr. Fish in Dr. Dolittle

Bobby Moynihan

as Dr. Mark Weller in Dr. Dolittle

Laya DeLeon Hayes

as Maya Dolittle in Dr. Dolittle

Yara Shahidi

as Charisse Dolittle in Dr. Dolittle

Jim Gaffigan

as Bettleheim in Dr. Dolittle

Kristen Wiig

as Owl in Dr. Dolittle

Patton Oswalt

as Male Pigeon in Dr. Dolittle

Melissa McCarthy

as Female Pigeon in Dr. Dolittle

Hank Azaria

as Drunk Monkey in Dr. Dolittle

Jordan Peele

as Rat #2 in Dr. Dolittle

Keegan-Michael Key

as Rat #1 in Dr. Dolittle

Bryan Cranston

as Jacob in Dr. Dolittle

Stephen Graham

as Blaine Hammersmith in Dr. Dolittle

Regina Hall

as Lisa Dolittle in Dr. Dolittle

Kevin Hart

as Rodney in Dr. Dolittle

Danny Glover

as Grandpa Archer Dolittle in Dr. Dolittle

Jamie Foxx

as Dr. John Dolittle in Dr. Dolittle

John Mulaney

as Lucky in Dr. Dolittle