Mark A.Z. Dippe Director Mark Dippé Director Phil Nibbelink Director Matt Whelan Director Pete Davidson Marmaduke Voice J.K. Simmons Zeus Voice David Koechner Phil Voice Jason Anthony Ronnie Voice Shelby Young Shantrelle Voice Tania Gunadi Cheerleader Voice Brian Hull Guy Voice Stephen Stanton King Tut Voice Julie Nathanson Dottie Voice Andrew Morgado Henri , Phillipe Voice Erin Fitzgerald Barbara Voice Terri Douglas Billy Voice Byron Kavanagh Screenwriter Daniel Chuba Producer Jonghan Kim Producer Youngki Lee Producer Timothy Wayne Peternel Producer Simon Crowe Executive Producer Matthew Joynes Executive Producer Bridget McMeel Executive Producer Louis Koo Executive Producer Fred Nelson Executive Producer Matt Sheppo Executive Producer Aaron Seelman Film Editing Nicholas Schnier Original Music Raylin Sabo Casting