Patton Oswalt Max (voice) Kevin Hart Snowball (voice) Eric Stonestreet Duke (voice) Jenny Slate Gidget (voice) Tiffany Haddish Daisy (voice) Lake Bell Chloe (voice) Nick Kroll Sergei (voice) Dana Carvey Pops (voice) Ellie Kemper Katie (voice) Chris Renaud Norman / Additional Voices (voice) Harrison Ford Rooster (voice) Bobby Moynihan Mel (voice) Hannibal Buress Buddy (voice) Pete Holmes Chuck (voice) Tara Strong Baby Liam / Sweetpea / Pickles (voice) Sean Giambrone Cotton (voice) Meredith Salenger Cat Lady (voice) Michael Beattie Lead Wolfdog / Skinny Cat (voice) Jessica DiCicco Princess / Tiny (voice) Garth Jennings Hamster (voice) David Acord Additional Voices (voice) Jaime Camil Additional Voices (voice) Antonio Raul Corbo Additional Voices (voice) Brian T. Delaney Additional Voices (voice) Terri Douglas Additional Voices (voice) Sandra Echeverría Additional Voices (voice) Kylie Hart Additional Voices (voice) JP Karliak Additional Voices (voice) John Kassir Additional Voices (voice) Scott Menville Additional Voices (voice) Scott Mosier Additional voices (voice) Laraine Newman Additional Voices (voice) Capri Oliver Additional Voices (voice) Lucian Perez Additional Voices (voice) Ashley Silverman Additional Voices (voice) Fred Tatasciore Additional Voices (voice) Cory Walls Additional Voices (voice) Matthew Wood Additional Voices (voice)