James Corden
Narrator
Dustin Hoffman
Mr. Hoppy
Judi Dench
Mrs. Silver
Salo Gardner
Mr Mavrokoukoudopolous
Lara Rossi
Puppy Boy Mother
Jimmy Akingbola
Keen Petshop Keeper
Katie Lyons
Philip's Mother
Pixie Davies
Roberta
Richard Cordery
Mr. Pringle
Pik-Sen Lim
Mrs. Wu
Polly Kemp
Woman Passenger
Alexander Bracq
Rollerblading Couple
Joseph West
Phillip
Anna Cannings
Mrs. Court
Lisa Hammond
Mrs Desmond
Emily Ralph
Little Girl
Geoffrey McGivern
Shop Keeper
Leo Umeh
Puppy Boy
Ronnie Hughes
Trumpeter
Jack Honeyborne
Pianist
Aaran Mitra
Boy in Pet Shop (uncredited)