Vital Statistics
Species Great Dane
Gender Male
Fur color Brown
Eye color Black
Other Statistics
Occupation Scientist
Family Scooby-Doo (nephew)
Skippy-Doo (nephew)
Howdy-Doo (nephew)
Ruby-Doo (niece)
Yabba-Doo (nephew)
Scrappy-Doo (grandnephew)
Production Details
First appearance APNSD: The Were-Doo of Doo Manor
Played by Don Messick

Horton-Doo is the "mad scientist" uncle of Scooby-Doo.

Physical appearance

He's a large brown Great Dane, he has a brown nose, wears a lab coat, a bow and small round glasses.


Horton-Doo is interested in science, monsters, and other scary things there are.


A Pup Named Scooby-Doo

Season three

He met Shaggy, Scooby and Velma in his lab where he showed them his scary stuff which led Shaggy to think he's Nasty-Doo. He was proven to be innocent after the case was solved.