Dexter is a kitten that Appears in the episode Oggy Has Kittens. He is taught by Oggy how to act like a cat.
- Hair Colors: White
- Fur Colors: Black
- Eye Colors: Blue (Light Blue)
- Nose Colors: Red (Red Pink)
Dexter has a black fur body and white fur on his feet and his head is the same shape as Jack's head, and has an oblong shaped tail.
- Oggy (Mentor)
He is afraid of cockroaches. He has more naturalistic cat behaviors like meowing, moving his tail, and sometimes can eat cockroaches, meaning that he lives in a trash can or a garage.
His own mentor to teach him to act like a cat and also warned him if he did it wrong. Minutes before, the cockroaches were barking at him and he hides in a trash can but Oggy rescued him from the cockroaches and Dexter goes to him, acting as if Oggy is his father.
- He is the second pupil of Oggy. His first was Marceline.
- Dexter had a minor appearance in High Rise Nightmare.
- He is possibly fan-named after Dexter from Dexter's Laboratory.