Bruce Willis as RJ (voice)

Garry Shandling as Verne (voice)

Steve Carell as Hammy (voice)

Wanda Sykes as Stella (voice)

William Shatner as Ozzie (voice)

Nick Nolte as Vincent (voice)

Thomas Haden Church as Dwayne (voice)

Allison Janney as Gladys (voice)

Eugene Levy as Lou (voice)

Catherine O'Hara as Penny (voice)

Avril Lavigne as Heather (voice)

Omid Djalili as Tiger (voice)

Sami Kirkpatrick as Bucky (voice)

Shane Baumel as Spike (voice)

Madison Davenport as Quillo (voice)

Ariel Winter as (voice)

Jessie Flower as (voice)

Paul Butcher as Skeeter (voice)

Zoe Randol as Mackenzie (voice)

Jessica DiCicco as Shelby (voice)

Debra Wilson as Debbie (voice)

Sean Bishop as Police Officer (voice)

Jeannie Elias as Janis (voice)

Kejon Kesse as Timmy (voice)

Sean Yazbeck as BBQ Barry (voice)

Geoffrey Pomeroy as Ranger (voice)

Joel McCrary as Dr. Dennis (voice)

Lee Bienstock as Lunch Table Larry (voice)

Brian Stepanek as Nugent the Dog (voice)

Steve Alterman as Additional Voices (voice)

Erin Lander as Additional Voices (voice)

Kirk Baily as Additional Voices (voice)

Jordan Orr as Additional Voices (voice)

Jessie Flower as Additional Voices (voice)

Michelle Ruff as Additional Voices (voice)

Nicholas Guest as Additional Voices (voice)

Greyson Spann as Additional Voices (voice)

David Hiller as Additional Voices (voice)

April Lawrence as Additional Voices (voice)

Bridget Hoffman as Additional Voices (voice)

Marcelo Tubert as Additional Voices (voice)

Sandy Holt as Additional Voices (voice)

Ariel Winter as Additional Voices (voice)

Talula Holt as Additional Voices (voice)