Josh Gad as Dogs: Bailey / Buddy / Tino / Ellie (voice)

K.J. Apa as Teen Ethan

Britt Robertson as Teen Hannah

Dennis Quaid as Adult Ethan

Peggy Lipton as Adult Hannah

Juliet Rylance as Elizabeth - Ethan's Mom

Luke Kirby as Jim - Ethan's Dad

John Ortiz as Carlos

Kirby Howell-Baptiste as Maya Williams

Pooch Hall as Al

Logan Miller as Todd

Gabrielle Rose as Grandma Fran

Caroline Cave as Ellen - Boss' Wife

Nicole LaPlaca as Wendi

Michael Patric as Sam

Michael Bofshever as Grandpa Bill

Primo Allon as Victor

Kalyn Bomback as Yolanda

Peter Kelamis as Dad's Boss

Jane McGregor as Rachel

Kelly-Ruth Mercier as Atlanta Vet

Kwesi Ameyaw as Cop

Paul Jarrett as Police Lieutenant

Anita Daher as Mother at Shelter

Alicia Johnston as Hysterical Mother

Naomi Frenette as Kidnapped Girl

Brooke Warrington as Bree

Bryce Gheisar as Ethan - 8 Years Old

Robert Mann as Delivery Workman

Ron Verwymeren as Delivery Workman

David J. Lyle as Country Vet

Cory Wojcik as Puppy Mill Owner

Ross Douglas Noble as Puppy Mill Customer

Andrew W. Nolan as Football Coach

Jordan Butterill as Teammate

John C. MacDonald as Teammate

Brent Holtzman as Police Captain

Christopher Pearce as Policeman

Violet Haas as Elderly Woman

Darcy Higginbotham as Farm Hand

Danesha Lee as Animal Control Officer

Dan De Jaeger as Father at Shelter

Reine Lecuyer as Daughter at Shelter

Rayna Ens-Armstrong as Daughter at Shelter

Mackenzie Thornton as Tweener Girl

Avery Thompson as Tweener Girl

Aidan Ritchie as Ambulance Attendant

Kenyan Alexander Walcot as Ty - 5 Years Old

Treyton Augustus Walcot as Richie - 4 Years Old

John Bluethner as Professor

James Janssens as Alzheimer's Patient

Paul Griggs as Hot Dog Vendor

Grant Burr as Hardware Store Clerk

Ronald Boyd Johnson as Neighbor

Chris Webb as Kidnapper

Evan Martin as Punk Boy

Tyson Wagner as Boyfriend in Park

Dean Mckenzie as Detective

Tom Young as Hardware Store Employee