The outrageously wisecracking Cheech Marin unleashes the laughs as the voice of a smart-alecky dog named Einstein who's out to find himself a new family... and a snack or two along the way! Einstein is a wisecracking dog with a huge appetite for outsmarting human beings!
| Actor | Role |
|---|---|
 Thomas GottschalkMartin | Martin |
 Priscilla PresleyKeelin | Keelin |
 Shia LaBeoufJoey | Joey |
 Ben FosterRyan | Ryan |
 Lin ShayeMiss Desmond | Miss Desmond |
 Jessica BowmanMarlena | Marlena |
 Howard MorrisAbercrombie | Abercrombie |
 Ben SteinJack | Jack |
 Armelia McQueenMs. Groomers | Ms. Groomers |
| TTamie Lea LoganJosie | Josie |
| NNavarone Garibaldi GarciaBilly the Paper Boy | Billy the Paper Boy |
| MMike KimmelThe Nasty Lifeguard | The Nasty Lifeguard |
 Wendy Benson-LandesCharlotte | Charlotte |
 J.P. ManouxChihuahua Owner | Chihuahua Owner |
 Allison SieBeagle Owner | Beagle Owner |
 Rick ZumwaltMusclehead | Musclehead |
 Roger Clinton Jr.Driver | Driver |
 Jason DavisChipper | Chipper |
 Erik CordJudge | Judge |
| JJohn TravisSarcastic Guy | Sarcastic Guy |
 John GatinsCop #1 | Cop #1 |
 George ChristyJudge #2 | Judge #2 |
| AAndrew BurkleBoy on Slide | Boy on Slide |
| CCarrick O'QuinnFireman | Fireman |
| CCecile KrevoyWedding Guest | Wedding Guest |
| FFrances BuchsbaumGrandma Guest | Grandma Guest |
 Cheech MarinEinstein (voice) | Einstein (voice) |