Good Boy!

Molly Shannon

Mrs. Baker

Liam Aiken

Owen Baker

Matthew Broderick

Hubble (voice)

Donald Faison

Wilson (voice)

Cheech Marin

The Greater Dane's Henchman (voice)

Brittany Murphy

Nelly (voice)

Vanessa Redgrave

The Greater Dane (voice)

Carl Reiner

Shep (voice)

Delta Burke

Barbara Ann (voice)

Kevin Nealon

Mr. Baker

Hunter Elliott

Frankie

Mikhael Speidel

Fred

Brittany Moldowan

Connie Fleming

George Touliatos

Mr. Leone

Patti Allan

Ms. Ryan

Ben Immanuel

Wilson's Dad (as Benjamin Ratner)