- Arlo as Cat
- Spot as Dog
- Brock Pearson (from Monsters University) as Winslow
- Johnny (from Monsters University) as Rancid Rabbit
- Thunderclap as Cliff
- Claire Wheeler (from Monsters University) as Shriek
- Chuckles (from Toy Story 3) as Randolph Grant
- Ivy as CatDog's Mom
- Forrest as CatDog's Dad
- Cliff as Mr DuBois
- Momma as Ellie Mae Sue
- Lord Dingwall (from Brave) as The Amazing Ray
- Fergus (from Brave) as The Wise Guy Of The Mountain
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