Harold is one of the main characters featured in Bunnicula.
He appears to be a short-haired, brown mutt and has a blue collar, a big nose and big ears.
He loves his friends Chester and Bunnicula, and their owner, Mina, but isn't the sharpest tool in the shed.
He has a silly personality, wants to take care of Bunnicula as shown in Son of Bunnicula by looking after Bunnicula as a son.
- In the books Harold is a ponderous, thoughtful character, forced to put up with the eccentricities of Chester and the new rabbit. His appearance in the book is also remarkably different, resembling an Old English Sheepdog, though he claims to have Russian Wolf Hound in him as well.